something unusual-------（happen)to you if you ----(not be ) careful

something unusual-------（happen)to you if you ----(not be ) careful
something unusual-------（happen)to you if you ----(not be ) careful

something unusual-------（happen)to you if you ----(not be ) careful
答案：填will happen,aren't
即：Something unusual will happen to you if you aren't careful.
翻译：如果你不小心,你就会发生不寻常的事情.
有不明白的请继续追问,

为你解答。
Something unusual（will happen) to you if you (aren't) careful .
句意：如果你不当心的话，不寻常的事可能就会发生在你身上。
主句是一般将来时态，从句是if引导的条件状语从句，用一般现在时表示将来。

1. will happen
2. are not
（if)主将重现

would happen,wouldn't be