17) I ____ (call) you if I _____ (not/forget) my phone.
[ would have called ][ hadn't forgotten ]
18) We _____ (come) if we ______ (be) invited.
[ would have come ][ had been ]
19) She _____ (not/do) it if she ____ (know) you were ill.
[ wouldn't have done ][ had known ]
20) He ______ (be) on time if he _____ (leave) earlier.
[ would have been ][ had left ]
