Question

every means have been tried but without much success哪有错的

Answer 1

1. have改为has，因为every means是指每种方法，表达的是单数含义；2. but without much success的说法比较不地道，改为but all failed比较好。和原句意也是符合的。

请采纳。

Answer 2

have 改成has，means表示方法，而不是复数

Answer 3

have 改成has，means表示方法，而不是复数