Modal verbs about past (Модальные глаголы в прошедшем времени)

Present form                          Past form                                   Example with past form             
1 can Could (general abilities in the past)
2 Be able to Was able to (specific occasion in the past)
3 may might  
4 Be allowed to Was allowed to  
5 must Had to  
6 Have to Had to  
7 will would He said he...
8 shall should He said he...
9 Need Need have V3-ed (But it happened)
10 should Should have V3-ed (But it happened)
 
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