条件状语从句

1. 地位-副词

2. 注意事项

①主将从现原则

②主句位置

③其他引导词

unless 除非

you will fail to arrive there in time unless you strart earlier.

as long as 只要

so long as you're happy, it doesn't matter what you do.

in case 万一，以防

take your umbrella in case it rains.

on condition (that) 在...条件下

i can tell you the truth on the condition that you promise to keep a secret.

supposing 如果

supposing it rains, shall we continue the sports meeting?

provided (that) 假如

he won't be against us in the meeting provided that we ask for his advice in advance.

④虚拟语气

if i were you, ... .

3. 主要问题及解决方案

4. 活动设计

chain story - group work

birthday party invitation - 

what will you do, if you ... . →情感态度引导