The present perfect is appropriate in the other half of the first sentence above because we are not stating specifically when each person died within that period of time, AND in addition, the total number of deaths could possibly change increase before the experiment is finished.
In the third sentence, we are measuring the amount of time that he has been blind up to now and he will continue to be blind into the future -- his blindness does not lie in the finished past. On the one hand, you talk about 'since the London Underground began' and then compare that to 'build'. What do you mean by 'began'? Do you mean 'began operating' i.
I'll assume you mean 'after the London Underground was built'. At any rate, saying that 'many other cities, such as New York and Moscow, have built their own systems' suggests that 'after the London Underground was built, many other cities started and finished the building of their own subway systems. The present perfect simple have built is appropriate if you mean that 'many cities have now finished building their own subway systems, and that possibly even more cities will build subway systems after now'.
You are not stating specifically WHEN each of these subways were built within the period of time you mention; you are only stating THAT they've been built. On the other hand, using the present perfect continuous have been building suggests that the building of subway systems in many cities has begun and the building is still going on now'. It is much less clear whether any of them have finished building. Dear Amy, thank you very much!
Pick or pick up? Play or game? Politics , political , politician or policy? Price or prize? Principal or principle? Quiet or quite? Raise or rise? Remember or remind? Right or rightly? Rob or steal? Say or tell? So that or in order that? Sometimes or sometime? Sound or noise? Speak or talk? Such or so? Towards or toward? Wait or wait for? Wake , wake up or awaken? Worth or worthwhile? Noun phrases: dependent words Noun phrases: order Noun phrases: uses Noun phrases: noun phrases and verbs Noun phrases: two noun phrases together.
Pronouns: possessive my , mine , your , yours , etc. Pronouns: reflexive myself , themselves , etc. Pronouns: indefinite - body , - one , - thing , - where Pronouns: one , you , we , they Relative pronouns Questions: interrogative pronouns what , who Someone , somebody , something , somewhere That. Dates Measurements Number Time. Geographical places Names and titles: addressing people Nationalities, languages, countries and regions Place names. Reported speech Reported speech: direct speech Reported speech: indirect speech.
British and American English Dialect Double negatives and usage Formal and informal language Newspaper headlines Register Slang Standard and non-standard language Swearing and taboo expressions. Past simple I worked Past continuous I was working Past continuous or past simple? Past simple or present perfect? Used to Past perfect simple I had worked Past perfect continuous I had been working Past perfect simple or past perfect continuous? Past perfect simple or past simple?
Past verb forms referring to the present Past: typical errors. Present continuous I am working Present perfect continuous I have been working Present perfect simple I have worked Present perfect simple or present perfect continuous? Present perfect: typical errors Present simple I work Present simple or present continuous?
Present: typical errors Present verb forms referring to the past. Finite and non-finite verbs Imperative clauses Be quiet! Infinitives with and without to Infinitive: active or passive? Perfect infinitive with to to have worked Verbs: basic forms Verbs: formation. Hate , like , love and prefer Hear , see , etc.
Get passive Have something done Passive: forms Passives with and without an agent Passive: uses Passive: other forms Passive: typical errors. Conditionals Conditionals: if Conditionals: other expressions unless, should, as long as Conditionals: typical errors If only In case of Suppose , supposing and what if Wish. Word classes and phrase classes Word formation Prefixes Suffixes Compounds Abbreviations, initials and acronyms -ish and -y Diminutives - let , - y and mini- Hyphens.
Word order and focus Word order: structures Cleft sentences It was in June we got married. Fronting Inversion No sooner Not only … but also. Relative clauses Relative clauses referring to a whole sentence Relative clauses: defining and non-defining Relative clauses: typical errors. Neither, neither … nor and not … either Not. Questions: alternative questions Is it black or grey?
Questions: two-step questions Questions: typical errors Questions: wh- questions Questions: yes-no questions Are you feeling cold? Questions: follow-up questions Questions: echo and checking questions Questions: short forms. My word lists. Consider this example: We have analysed the tax aspects of the transaction since we were instructed to do so. Share this: Facebook LinkedIn. Like this: Like Loading This entry was posted in Uncategorized and tagged Adverbs , Conjunctions , Prepositions , Time expressions.
Bookmark the permalink. September 25, at pm. Alimotij5 says:. June 3, at am. Which one is correct? Since he……president,both taxes and unemployment……. A has become — increased B became — have increased.
June 3, at pm. B is correct — See my explanation at 1. From a time in the past until the present. Rose says:. September 17, at am. Is it correct to use since on the end of a sentence? If yes, which situation? September 19, at am.
San Samman says:. November 24, at pm. November 25, at am. JJs says:. April 17, at am. HuaGoor says:. June 16, at am. June 16, at pm. Kyeoptashi says:. June 21, at am. Anila Celin Poly says:. August 11, at am. Rachel says:. September 3, at am. Hi everyone, I am really confused about the use of since with the simple past can we use since with simple past whenever we wish or there are certain conditions Is this sentence correct for example I finished my university studies since thanks.
Consider: I finished my studies in Note that "since" can also mean "because". I finished my university studies since Click to expand Pimfan New Member English - American. You can use the simple past here.
Here since means at an unspecified point in time that occurred in the period from to the present. When since means throughout the period from a specified point in past time to the present, use the present perfect: I have been a student since JungKim Senior Member Korean. Pimfan said:. I think you are mistaken about this. Regardless of issues regarding "since", we don't use the simple past with unspecified points in time. When the time is not specified, we use the present perfect.
So grammar dictates that the sentence be, "I have graduated from university since My guess is that the original poster was trying to indicate that is his year of graduation, in which case "since" is entirely inappropriate.
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