風邪をひいているときは、あなたは朝によく鼻をかみます。

When you have a cold, you often blow your nose in the morning.

もし彼らが式の最中に鼻をかんだら、私たちは彼らにティッシュを差し出さなければならないだろう。

If they blew their noses during the ceremony, we would have to offer them tissues.

もし入る前に鼻をかんでいたら、毛布を汚さなかったでしょう。

If you had blown your nose before coming in, you wouldn't have dirtied the blanket.