英语句子，帮忙看看有没有语法错误。。谢了~

Question

1.Only he who has enough knowledge can helps others with facility which also can make the expert more professional.
2.Only if he has enough knowledge can he help others with facility which can also make the expert more professional
3.his zeal can help him to get along well with everybody he met no matter bad-tempered they are.
4.politeness is essential to expert.

Answer 1

第一句can已经是动词，后面的help不能再加 s.
第二句虽然很瘪嘴，但是勉强算没有语法错误，就是啰嗦又不顺。最好是说：
Only with enough knowledge can he help others with facility. This can also make the expert even more professional.
第三句，减to, met 不能是过去式要改成 meets, no matter 后面要加how
His zeal can help him get along well with everybody he meets, no matter how bad-tempered they are.
第四句如果expert指的是“专家”的意思，要说Politeness is essential to experts 或 Politeness is essential to an expert。 也就是要么前面加a为单数、要么后面加s为双数。如果你是想说“专业”的话，要改成：Politeness is essential to be professional.

Answer 2

1.Only he who has enough knowledge can helps others with facility the(后面有定语要加冠词) facility which（also去掉，这是限定facility的与前面没关系）can make the expert more professional
不过我觉得这样比较好
Only he who has enough knowledge can helps others (to) fortify their facility and (to)make experts more professional.
2.having enough knowledge， he can后面一样（换种形式用现在分词代替）原来的he 重复了不好看。
3.his zeal can help him （to 可省略) get along well with certain people he met no matter how bad-tempered they are.
4.good manners are essential to experts 或者courtesy is....
politeness有点教养的意思追问

那您觉得第一句和第二句哪个更好一点？

Answer 3

同意楼上的