They (go) on holiday if they (have) time.
They'll go on holiday if they have time.
We (be) late if we (not/hurry).
We'll be late if we don't hurry.
She (take) a taxi if it (rain).
She'll take a taxi if it rains.
I (not/go) if you (not/come) with me.
I won't go if you don't come with me.
