Must have and Must be

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hi Alan

I have some question to ask you

  1. what are different between must/might/may/should/could/would/will+ have… and must/might/may/should/could/would/will+ be…?
  2. about passive for example
  • that house was built in 1977----> Can I say : that house have been built since 1977 or for over 30-year ago.is it similar meaning?

thank you in advance

pattana

2

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  1. what are different between must/might/may/should/could/would/will+ have… and must/might/may/should/could/would/will+ be…?-- This is far too broad a question to be dealt with here. Please do some basic reading on MODAL AUXILIARIES.

  2. about passive for example

  • that house was built in 1977----> Can I say : that house have been built since 1977 or for over 30-year ago.is it similar meaning?-- No, that structure is not semantically good English.
    .