ABILITY

我小时候不会游泳。

I ___couldn't swim when I was a child.

我昨天打不开门，因为钥匙不见了。

I ___couldn't open the door yesterday because the key was missing.

因为太吵了，我们没法说话。

We ___couldn't talk because it was so noisy.

他昨天不能来参加聚会，因为他感冒了。

He ___couldn't come to the party yesterday because he had a cold.

我昨晚睡不着，因为隔壁太吵了。

I ___couldn't sleep last night because the neighbors were too noisy.