I saw Tom yesterday .We hadn't seen each other since we left school.为什么不是现在完成时

On my way home yesterday I saw Tom ______ some roses from a flower shop (buy) Tom's parents saw the accideThe flowers have been watered,i forgot______(do) it Tom's parents saw the accident ______(happen))yesterday afternoon请说明原因! I saw Tom yesterday .We hadn't seen each other since we left school.为什么不是现在完成时 I visited (Tom,Tom's)house yesterday. I saw [你]in the bookstore yesterday I saw her dance yesterday变被动 i saw him yesterday改为否定句 I saw an i___ talk show yesterday. Did you see tom yesterday afternoon?yes,i saw him____the fence when i passed.A.climb B.climbedC.climbing D.to climb I saw you singing yesterday与I saw you were singsing yesterday 有什么区别? Yesterday I saw a movie与I saw a movie at yesterday一样的吗? I saw him yesterday afternoon=I saw him in the afternoon yesterday吗 I saw Tom yesterday.He ( )from England already.A.have been caming B.has come 为什么选B不选A I saw them______(quarrel) yesterday afternoon.I saw them______(quarrel)this timeI saw them______(quarrel)this time yesterday afternoon. I met Tom on the playground yesterday. i know the middle -aged woman____ i saw yesterday. 英语填空,请说出理由.1.I saw you yesterday.You （ ）running in the park.A.are B.were2.What （ ）Tom doing when you saw him.A.did B.was请说出理由 the boy i saw yesterday;i saw the boy yesterday;this is the boy i saw yesterday三句话的翻译,区别?