By Difference between, Past simple

Hi teachers,Could you possibly tell me whether there is any difference between the past simple and past perfect in this sentence: They did not know each other until I introduced them.(simple past) They did not know each other until I had introduced them.(past perfect)Thank you in advance

In an excellent advanced grammar book, Exploring Grammar in Context by Carter & Hughes & McCarthy, this exercise was given on the present perfect.(page 7, exercise 4, item c)Choose between the present perfect and past simple tneses for the verbs in brackets. If you think both are equally...

Hi!I've got a problem connected with the difference between these two pairs of sentences. I hope you can help me.1.I painted my room yeaterday./I read a book yesterday.2. I was painting my room yesterday./I was reading a book yesterday.It's obvious that in the case of (2), I focus on the action...

Newbie2007 wrote: Quangtn03 wrote: Hi newbie."I wish you will have..." is a true conditional sentence. I think this is a letter so the writer have a wish for his friend.The latter is "I wish you will be happy", not "I wish be happy". He write for friend not for himself. Are you ok? Tell me what...

Hi, He has spent money with gay abandon...(Cambridge Advanced Dictionary) He spent money with gay abandon. Well, what is the difference between the two? First, let's look at a simpler pair of examples. Mary has cooked dinner. Mary cooked dinner. Do you know the difference between these?...

He has spent money with gay abandon...(Cambridge Advanced Dictionary) He spent money with gay abandon. Well, what is the difference between the two?

Kooyeen wrote:Hi,Could someone comment on these? I don't understand the difference between present perfect and past simple in passive constructions. Can both of the tenses be used, even if something just happened? (for example, the bank was robbed 1 minute ago or later)Holy cannoli! What a...

Hi,Could someone comment on these? I don't understand the difference between present perfect and past simple in passive constructions. Can both of the tenses be used, even if something just happened? (for example, the bank was robbed 1 minute ago or later)Holy cannoli! What a mess... You guys all...

David Little wrote:Can anyone tell me about how to use have and had?I mean have taken, had taken, has taken etc..What's the difference between I have drunk a cup of tea.I drank a tea.I had drunk a tea.It would be helpful if you give when to use these (point in time).-->In what context would a...

Anonymous wrote:What exactly is the difference between 'I used to do sth" and "I did sth"? I mean, I often hear that people use the past simple tense to talk about repetetive actions, e.g. "I sold computers". Can I use "I sold computers", "I used to sell computers" and "I'd sell computers" in...