By Constructions, Present perfect

Hello. In this construction with once, can I use present simple or present perfect? Is there any difference? Once you have bought the car, send me the invoice. Once you buy the car, send me the invoice.

The ceiling has been being painted. I know that we use Present Perfect Continuous in passive voice rarely, nevertheless the majority grammar books says that it can be used. When? In what type of sentences? Can i change "I have been painting the ceiling" into passive? RH: While the structure...

I don't oppose to anita's answer, though I'd say "X has belonged to Y since 2002" is a present perfect sentence rather than a past perfect one. However, I am not sure about whether we can say "X belongs to Y since 2002" is completely wrong. It is true 'since' is usually used in perfect and past...

Sir, IV - The present prefect used with "for" and "since" A. "for" is used with a period of time: for six days, for a long time. "for" is used with the simple past tense denotes a terminated period of time. (e.g) We lived there for ten years. ( but we don't live there now) "for"...

Rule: Modal verbs (and "must" is one of them) cannot be followed by a past tense form. To express past tense after a modal add "have" and the past participle. This is not truly a "present perfect" but a "modal perfect". In the case of the modal perfect construction the difference between simple...

Rule: Modal verbs (and "must" is one of them) cannot be followed by a past tense form. To express past tense after a modal add "have" and the past participle. This is not truly a "present perfect" but a "modal perfect". In the case of the modal perfect construction the difference between...

Very true, Aeolus29. There are only two tense inflections in English - the "s" for the present (only for third person singular), and the "ed" for the past. In this sense there are only two tenses. All the other verbal machinery of English depends on combining auxiliaries and/or modals with the...

Mr P: The distinction is clear, and has nothing to do with {teeth on edge} 'inclusiveness': Let us have no more touchy-feely grammar. JT: I allowed that it might, Mr P. I didn't state that it did. You may want to adress this issue with Casi. But before you do that, consider that grammatical...

NC: Let me point out, JTT, that the issue at hand was whether "can't" could be used instead of "couldn't", so I have simply gone through the tenses, to identify where it was or not permissible, as well as stressing the varying functions of "just" with respect to the tenses, which teachers often...

The "GO DO SOMETHING" Family of Colloquial Expressions There are several variants of "go do" in American English. All are used informally in conversation, and almost never in formal writing. In the following discussion, the verb "do" stands for any verb, but the list of verbs normally used...