Fill in the blanks with (not) to be able to in the right tense: 1.I.............. lock the door yesterday morning ; I had lost my keys. 2.I.......................come to your graduation party next month; some friends from abroad are coming to visit me. 3.Jack ............... ....to get to work yesterday; his car broke down at the crossroads. 4.I ........................................... make msny new friends since we moved to this town. 5.My mother is always busy with housework; she ........................................................................never to sit down. 6.I.............................................. to learn how to swim if I spent a month at the seaside. 7.He .............................................to drive a car for years when I met him. 8.My sister ............................................. to teach after more practice.