Употребите глаголы в нужном времени. 1.if it (to be) convenient,let's meet at nine o'clock.2.it will be impossible for me to finish my work if you (not to cease) your chatter.3. if you (to want) to have tea in time,put the kettle on.4.if she (not to answer) the telephone,she would never have heard the good news.5.tell him he must visit the tower if he ever (to go) to london.6.my friend would be able to help us if (to be)here
