The document discusses derivative and conditional sentences in English. It provides examples of conditional sentences with blanks to be filled in with the appropriate verb form, including:
1) If the mechanic had done the work properly, I ______ no problem with my car yesterday.
2) I ______ if the payment had been better.
3) If only we ______ the police for directions, we wouldn't have got lost.
The document contains practice conditional sentences to help learners understand proper verb usage in different conditional situations.