break into 可以加 laughter吗?还是加laughing?

break into 可以加 laughter吗?还是加laughing? burst into laughter,burst out laughing.二者用法 break into a laugh和break into a laughter的区别 break off后面都可以加什么? We couldn't help laughing.help不是加do吗?难道laughing作动名词? burst into laughter 是动词短语吗 enter into 后加动名词还是不定式 burst into laughter/tears brust into laughter造句 move后面要加in还是加into还是不加. entered后不能加into吗 break the rule的rule要加s吗