Verb tenses worksheet for Year 8 & Year 9 with full answer sheet and grammatical explanations

A worksheet on the uses of past tenses with certain keywords including for since and ago, still, already and yet, after, before and while, plus the structure of conditional sentences. Aimed Year 8 and Year 9 students, learning English as a second or foreign language. Can also be used for revision with older classes.
The questions are all multiple-choice, a,b,c, or d.
The file comes with complete answers and a detailed explanation of the grammar involved. The worksheet can be given as homework to go over in class, or as a pointer as to how the students perform, and where their weakest points lie.