By Perfect progressive, Difference between

Hi, there! Here are my doubts. Could you help me, please? - He (write) a composition since lunch time. In this kind of sentence I could use e.g. the * Present Perfect Progressive: - He has been writting a composition since lunch time. In this case since is a starting point and the verb tense...

Present Perfect is formed with the auxiliary have and the past participle of some verb: have seen, has done, have lived. Present Perfect Progressive is formed with the auxiliaries have and been and the present participle of some verb: have been seeing, has been doing, has been living.CJ

Hi everyone,I have a few grammar questions and I don't know how to answer them:Explain why the verb “To Be” is not a non-progressive verb?I know the simple present never talks about the present but what can be an exception to this rule?Why does the present tense not exist in English? What...

WesternAmerican wrote:Thank you very much, Thai.That was my friend asking those questions on my behalf.In regard to your '' I am full, I have been eating 2 bowls of rice'' -- You used the Present Perfect Progressive for that clause, claiming that the act of eating has stopped, but I could just...

I would like to share my 2-cent worth with you all. There are two parts to the question: a) the usage of the present progressive tense and b) the usage of the present perfect vs. that of the present perfect progressive. In general, the progressive form (i.e., -ing form of the base verb) is...

Wouldn't you say there are twelve tenses? Simple , Progressive, Perfect, Perfect Progressive - each with past, present, and future tenses - for a total of twelve? What is the difference between, for example, Future Perfect in the past and Future Perfect? Is it just the modal auxilary "would"...

CalifJim wrote:Yes. It disagrees with me.It seems you knew the answer before you asked the question.CJ The website above says there is no difference between Present Perfect & Present Perfect Progressive. How can be?

Onh1986 wrote:So what the difference between: - I was thinking. - I have thought.Hi,it is difficult to answer, because you should put verbs in example sentences in order to understand how to use them.I am thinking now. That's what I'm doing now. I'm thinking about my new invention. Please...

So what the difference between: - I was thinking. - I have thought.

But I know that in Past Progressive, there must be two clauses conjuncted by "when" or "while". Is that true? If so, what the difference between: - I was thinking. - I have thought.