The present simple tense

S + shall/will have been + V­­­­­ ^1ing
I /we shall have been watching T V for 2 hours when you come.
S + shall/will have been +not + V­­­­­ ^1ing		You /he/ she/ they will have been watching T V for 2 hours when you come.
Shall/will S +have + been+ V­­­­­ ^1ing		Will you have been watching T V for 2 hours when you come?
Wh+ shall/will + S +have + been+ V­­­­­ ^1ing		Where will they been watching T V for 2 hours when you come?

B: signal so’zlari: for, since + future Simple + when+ S + V1,

How long______?

It will have been raining since morning when you come.

How long will you have been studying English by Januar?

Continuous da ishlamaydigan fe’llar perfect continuous o’rnida perfect da ishlatiladi.

I shall have known him for 20 years by January.

Ishlatilishi: Kelasi zamonda ma’lum bir vaqtgacha yoki biror bir ish –xarakat bo’lguncha tugagan ish –xarakatni muddatini ko’rsatadi.

Ilhom will have been playing for 2 hours when you come.