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解説をお願いします。

(QA の各文の( )内から適する語句を選び, 記号をひのでかこみなさい。
1) We(アshall be(イhave been ウhadbeen to ) here since last summner.
(⑫) Dick 《ガ has イ was ウ had been ) sleeping for two hours when his friend
visited him.
(3) Keiko (アhas イhave ウwill have ) read the book by tomorroWw.
4) When igot home, found thatI(アleft イhasleft ウhadle人) my umbrella
inthebus、
(5) My father (ア has イ has been ウ will have) used this car for three years
next spDring.
(6) Yesterday 』 went to see Mary as 1 (ア havent イhadnt ウ wonthave ) seen
her for several months.
7 Mike and Bill (ア know イ have known ウ havebeen knowing エ will have
known ) each other since they were children.                                          〈和光大〉

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