1.从句为陈述句,常选择引导词that或将that省略,直接与主句相连。
2.从句为一般疑问句,常选择引导词if或whether。在 whether … or not 结构中不能用 if 替换。
3.从句为特殊疑问句,常选择what, when,where, which, who, how等疑问代词、疑问副词作引导词。注意:当who为主语时,句式为:who+谓语+其他。
例句:
He is wondering when he can finish thisdifficult job.
I don’t think he likes the English teacher.