Rob 使用动词现在式与过去式的形式练习'if', 这就是被我们叫做的'条件句'。
看看视频内容，做做任务练习。
Decide if the speaker believes the events in the following sentences have a real possibility of happening or if they are unreal situations.
Exercise
Fill in the gaps to complete the sentences.
Decide if the following sentences are true or false.
