if

The ending glossed if takes these forms in the book's examples:

In the examples

If it rains, we'll stay at home. · 20.6 -se: if

If you don't come, Ali will be upset. · 20.6 -se: if

If there's a problem, call me. · 20.6 -se: if

If you have time, come over. · 20.6 -se: if

If you're ill, stay at home. · 20.6 -se: if

Take whatever you want. · 20.6 -se: if

I wish you were here. · 20.7 Wishes, and if things were different

Shall we have a coffee? · 20.7 Wishes, and if things were different

If I had time, I'd come. · 20.7 Wishes, and if things were different

If I were you, I wouldn't go. · 20.7 Wishes, and if things were different

I'll go even if it rains. · 20.7 Wishes, and if things were different

I wish you had come too. · 21.7 The grammar beyond this book