Present perfect or past semple ? 1. he never (fly) by plane. 2. we always (take) little luggage when we travelled. 3.mary (not buy) a ticket yet. 4. you (find) all the books in the libray? 5. you (understand) everything? 6. look! bobby (fall) down. 7. the cake is very tasty.who (make) it? 8. what a nice bird-hous! mike (make) it himself?