1. Put the right form of the verb to be in Present, Past, Future Continuous: 1. I ... taking five courses this semester. 2. Bill ... trying to improve his English. 3. Sue ... writing another book this year. 4. John and Mary ... talking on the phone. 5. I need an umbrella because it ... raining. 6. We ... walking down the street when it began to rain. 7. It was beautiful yesterday when we went out for a walk, it ... not raining, the sun ... shining. 8. I couldn't get you on the phone last night, who ... you talking to so long? 9. What ... you doing at 6 tomor¬row? 10. We ... playing chess in half an hour. 11. She ... lis¬tening to her favourite music at 8 o'clock tomorrow. 12. What ... you ... doing when I come?

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1. I am taking five courses this semester. - Present Continuous: Using the verb "be" in the present tense (am) + the base form of the verb "take" + ing (taking) to indicate an action happening now.
2. Bill is trying to improve his English. - Present Continuous: Using the verb "be" in the present tense (is) + the base form of the verb "try" + ing (trying) to indicate an action happening now.
3. Sue will be writing another book this year. - Future Continuous: Using the verb "be" in the future tense (will be) + the base form of the verb "write" + ing (writing) to indicate an action that will be happening in the future.
4. John and Mary are talking on the phone. - Present Continuous: Using the verb "be" in the present tense (are) + the base form of the verb "talk" + ing (talking) to indicate an action happening now.
5. I need an umbrella because it is raining. - Present Continuous: Using the verb "be" in the present tense (is) + the base form of the verb "rain" + ing (raining) to indicate an action happening now.
6. We were walking down the street when it began to rain. - Past Continuous: Using the verb "be" in the past tense (were) + the base form of the verb "walk" + ing (walking) to indicate an action that was happening in the past.
7. It was beautiful yesterday when we went out for a walk, it was not raining, the sun was shining. - Past Continuous: Using the verb "be" in the past tense (was) + the base form of the verb "rain" + ing (raining) to indicate an action that was not happening in the past. Also, using the verb "be" in the past tense (was) + the base form of the verb "shine" + ing (shining) to indicate an action that was happening in the past.
8. I couldn't get you on the phone last night, who were you talking to so long? - Past Continuous: Using the verb "be" in the past tense (were) + the base form of the verb "talk" + ing (talking) to indicate an action that was happening in the past.
9. What will you be doing at 6 tomorrow? - Future Continuous: Using the verb "be" in the future tense (will be) + the base form of the verb "do" + ing (doing) to indicate an action that will be happening in the future.
10. We will be playing chess in half an hour. - Future Continuous: Using the verb "be" in the future tense (will be) + the base form of the verb "play" + ing (playing) to indicate an action that will be happening in the future.
11. She will be listening to her favourite music at 8 o'clock tomorrow. - Future Continuous: Using the verb "be" in the future tense (will be) + the base form of the verb "listen" + ing (listening) to indicate an action that will be happening in the future.
12. What will you be doing when I come? - Future Continuous: Using the verb "be" in the future tense (will be) + the base form of the verb "do" + ing (doing) to indicate an action that will be happening in the future.