英语好的帮一下!以下几个句子的重要语法（知识点）基本句型,例句,用法1.Had it not been for the

1.是将IF 删去 然后将could should had等提前的现象.
1.对过去的虚拟：if sb had done ,sb should /could /would have done.
对现在的虚拟：if sb v-ed (were),sb would /could /should do.
对将来的虚拟：if sb should do /were to do /v-ed,sb would /could /should do
2.至于说是定语：the man called Tom （那个叫做TOM的男孩）定语是修饰那个中心语TOM解释为“叫.的”；状语：Worried about the time available ,He got up early.是指在后面的句子“主谓宾”齐全的情况下,又出现一个动词,看动词和主语的关系,主动用VING 被动用DONE 至于部分词组“be worried about "去掉BE后是怎么样就是怎么样写上去（其实可以理解成He was worried about 将He was 省略了.）