`1)` I couldn't go to the party because it was snowing hard.

`->` S + could (not) + V-inf: ai (không) thể làm gì trong quá khứ

`->` S + was/were (not) + V-ing ... ; it đi với was

`->` clause `(1)` + because + clause `(2)`: bởi vì

`2)` Jerry could hardly solve the riddle.

`->` S + could (not) + trạng từ chỉ tần suất + V-inf: ai (không) thể làm gì trong quá khứ

`->` hardly `=` have terrible problems: gặp khó khăn

`-`

@magnetic

I wanted to go to the party, but it was snowing hard.

⇒I couldn't go to the party because it was snowing hard.

Jerry had terrible problems with solving the riddle. (hardly)

⇒Jerry could hardly solve the riddle.

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Công thức:

I couldn’t+$V_{0}$ +because+ lý do/mệnh đề chỉ lý do

S+could hardly+$V_{0}$

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