Поставьте глаголы в нужном времени. 1. we (to have) our classes on chemistry in a chemical lab. 2. last week the students always (to make) many interesting experiments. 3. the students always (to weigh) substances before the reaction. 4. we (to study) organic chemistry next year. 5. we (add) some drops of acid to metallic zinc. поставьте предложения в вопросительной форме. 1. we used different apparatus for conducting an experiment. 2. they put a burning match at the top of the flask. 3. the students need some metals and acids for the experiment. 4. i went home after the lesson. 5. last year i was a pupil. 6. we weighed substances on the scales. поставьте предложения в отрицательной форме. 1. we recorded the yield of the reaction. 2. they used beakers for weighing substances. 3. i put some metals into the flask. 4. our teacher used new methods in the experiments. 5. our students made many interesting experiments. 6. last week i worked at my report.