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一般过去时的构成及用法
一般过去时表示过去的动作或过去存在的状态，由动词的过去式构成。动词be的过去式为was/were， have的过去式为had. 除不规则动词外，其他动词的一般过去式通常都是在词尾加-ed.
规则动词的过去式规则
1.大部分在词尾直接加-ed
mend-mended wait-waited
talk-talked discuss-discussed
2.以-e 结尾的动词，词尾只加-d
replace-replaced assemble-assembled
phone-phoned advise-advised
3.以重读闭音节结尾的动词，双写词尾的辅音
后，再加-ed
fit-fitted stop-stopped
occur-occurred stab-stabbed
4.以辅音字母+y结尾的动词，先将y变为i，再加-ed
try-tried occupy-occupied
5.以-ic 结尾的动词，先在词尾加K，再加-ed
picnic-picnicked traffic-trafficked
一般过去时的用法
1.表示过去某一确定时间发生的动作或存在的状态，可能是一次性的，也可能是过去经常反复发生的，常与表示过去时间的状语连用.
He lost his purse yesterday.
It was very cold last night
Last year we were rather busy.
When he was a child，he observed things carefully.
He always got up too late， and never had enough time for breakfast.
2.用于虚拟语气中，表示对现在或将来的假设，主观意图或愿望等.
I wish l had your brains， I＇m too stupid.
3.在时间、条件状语从句中，常用一般过去时代替过去将来时，表示过去将来的动作。
They said they would let us know if they heard any news about him.