语序：陈述语序 Tell me what your name is.
连词： 陈述句用that, 可以省略 He thinks (that) he will arrive on time.；
一般疑问句用if/whether I don't know if/ whether he is Tom；
特殊疑问句用特殊疑问词作连词Tell me what you want/ where you want to go/ how you are going to do that...。
时态： 1 主句是现在时态，从句根据需要使用任何时态。I don't know what he did just now.
2 主句是过去时态，从句用相应的过去时态。I knew that you were playing games that time.
3 只要从句陈述的是客观真理，就用一般现在时态。Our Geography teacher told us that the earth travels roung the sun.