IV. Open the brackets In IVotutnl Porfocl Continuous or in Past Perfect Continuous:
1.1____________ (to learn ) Spanish since December.
2. John_____________ (to smoke) for 20 years when hefinally gave it up.
3. Hello Jack! How long you____________ (to wait) for me?
4. When I arrived, Ann_____________ (to wait) for me.
5. Your child is so dirty! What he________________ (to do)?
6. This student_______________ (to write) a composition fortwo hours before his parents came.