grammar:speculating , with a coaching

when we speculate about the present,we use*
a modal verb + be

ــــــــــــــــــــــــــــ
when we speculate about the past,we use*
a modal verb + have +3rd from of the verb

grammar page :36
ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ

سأكتب الجواب فقط

1.be
2.have built
3.have belonged
4.be
5.be
6.have known
7.have brought
8.be
9.have explored
10.have noticed

coaching page:37

ــــــــــــــــــ
modal verbsوإستخدامتها:

1.must/I'm sure it's true
2.may.might.could/maybe it's true
3.may not/maybe it's not true
4.can't/I'm almost sure It's not true

ـــــــــــــــــــــ

Regards:عبدالملك إبراهيم الطاسان 209