Read and translate the sentences.pay attention to the past perfect tense.put these sentences into negative and interrogative forms 1. by the end of the year we have learnt to draw the diagrams. 2. i had finished the project by the beginning of that week. 3. fortunately i had read the instruction
before we started making that experiment. 4. after the teacher had left, the students began to talk. 5. we had visited the state polytechnic museum of igor sikorsky kyiv polytechnic institute by the 15th of september

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