不知道你是几年级的,是不是初三的,我就在这里说一下吧.
1.There be … .2.IT is… 句型 3.I Found it difficult to do sth.(头重脚轻的宾语从句）就可以转换为第二种情况 4.if、whether引导的条件状语从句 5.表语从句：比如 the flower is beautiful .6 so that (too …to)从句 意为太.…而不能 The women is so/too weak that she can't hand her hands up.让步状语从句(由how、what、whatever=NOmatter、when、where等特殊疑问代词及疑问副词引导)：NO matter how hard the work ,is,he will solve the problem.希望对你有所帮助.