Open the brackets using correct verb form in perfect continuous tenses 1. the telephone (to ring) for 5 minutes, why don’t you answer it. 2. he (to teach) german for 2 years when i begin to teach english. 3. tomorrow it will be a month as they (to work) on this project. 4. he (to come) here day after day for years. 5. at 8 in the morning we (to drive) for 6 hours. 6. by that time she (to study) already for 3 years.