1.Let’ s rehearse, okay? "rehearse"＂排练＂
eg: We hadn’ t rehearsed often enough so I forgot my lines. 我们俩排练得不够所以我忘了台词．
The play rehearsal is on at 4pm today. 那个剧今天下午四点钟彩排．
2.As a symbol of my vow. "a vow "＂n./v.发誓＂
eg: He vowed never to cheat me again. 他发誓再也不会骗我．
Husbands and wives both take vows of sincerity. 丈夫和妻子要发誓忠于对方．
3.What are they up to? "be up to = be doing sth "＂正在做sth＂
eg: If my parents knew what I was up to they’ d be angry. 要是我爸妈知道我在干什么的话，他们会生气的．
A: What are you up to? 干嘛呢？
B: I’ m looking for my key. 我在找钥匙呢．