Составьте предложения с этими словами в Present Perfect. Border
Chain
Coast
Flow
Perfect
Plain
Stretch
Valley

вот ответ вроде так наверное

i have worked hard to improve my english. joan does not have to go.she can stay here.i am sorry i am late.i had to do the shopping.i think the spacemen have to know english.does she have to read this rule.tom does not have to use the computer. you have to know english to understand people.does mary have to help ann to study english.what time do you have to get up.does your teacher have to correct your homework.

-good afternoon.how can i help you?                                                                               -good afternoon/ i want to buy a souvenir.                                                                   -how about this bell ?                                                                                                   -oh ,  that s(перед s наверху апостроф) a good idea ! how much is it ?                           -it is 6 pounds.                                                                                                           -can i have two , please ?                                                                                               -sure/ that s       (перед s наверху апостроф )   12 pounds.                                             -thank you. goodbye.                                                                                                   -goodbye.