fail to do sth是未能做某事?还是失败做某事?

fail to do sth是未能做某事?还是失败做某事? used to do sth是过去经常做某事还是习惯于做某事 used to do sth.是被用来做某事还是过去常常做某事 not fail to do sth.是''一定能做某事''的意思吗 失败做某事（做了的）是不是fail in doing?in能省略吗 fail to do 是根本就没做 翻译为没能做某事 容易做某事 是easy to do sth 还是be easy to do sth 尽力做某事是try one's best to do sth.还是try to do sth. 准备做某事 是get ready to do sth还是ready to do sth 是pretend do sth 还是pretend to do sth(假装做某事) 英语中“错过做某事”是“miss to do sth.”还是“miss doing sth. 建议某人做某事是suggest sb. to do sth还是suggest sb. doing sth 能够做某事是be able to do sth还是doing sth