Впредложениях нужно заменить имена собственными местоимениями alex is a good cook. kitty is cold,kitty is not happy. tom and i can see a big boat. mark ross is a grandad.

 Kitty is cold,Kitty is not happy-It is cold,i is not happy
 Alex is a good cook.-He is a good cook.
Tom and I can seea big boat. -He and Ican see big boat
Mark Ross is a grandad.-He is a grandad