◆時制３　時と条件の副詞節
If it is fine tomorrow, we will have a picnic. 明日晴れたら、ピクニックに行く。
When she comes, I will tell her so. 彼女が来たら、そう言っておきます。

＊超重要ルール
「時・条件の副詞節の中では、未来のことでも現在形」
while, before, after, till/until, as soon as, by the time, once… などの接続詞が使われる。
1) I’ll finish it before you ( ) home. [coming / come / came / comes ]
2) As soon as he ( ), you can leave. [ arrive / arrives / had arrived / is going to arrive ]

(解答) 1) come  2) arrives