1、happen:“发生”,动词原形.
2、happens:“发生”;一般会说“It always happens in the night”.
3、happened:“发生过了,发生了”,是过去式;例如“Many accidents happened last year.”
1、happen:“发生”,动词原形.
2、happens:“发生”;一般会说“It always happens in the night”.
3、happened:“发生过了,发生了”,是过去式;例如“Many accidents happened last year.”