Нужно исправить ошибку в каждом из следующих предложений. 1.this is a useles task. 2.i drink less than we does. 3.the red one are sweeter. 4.i can do it more better. 5.is the engine accelerating good?

1useless 2 do 3 one of the sweater are red 4 i can do it better

1.we will believe you, dear, just after you tell the truth.2.they will contact with  us after receive the latest data.3.i will tell you all, while someone else did not do so.4.you can sit down, kids, only after washing your hands.  and you can walk only after eat porridge. 5.  we meet at six o'clock at the fountain, in case you forgot.6.tell us once you will know the exam results/7.your mother will understand on your face before you open your mouth.8.  they will finish repairs before winter.9.we must to lay the table before guests shall come.

Dear arthur, thanks for your letter. you asked me if i have an advice for you, well i have.   first of all, you should know what your friend likes. for example, if your friend is fan of pens, pencils etc. then buy him unique pen/pencil. if your friend likes lego or toys, then buy him lego set. if your friend fan of star wars, then buy him a glass or t-shirt. but for everything i put in this letter upper can walk into shadows once i'll tell you, that best gift on birthday is book. interesting with surprise inside of it. for instance, money. you can put $10 inside of the book. it'll be good surprise for your friend.   well, anyway i have to go now. i'm looking forward for your letter. bye, someone (тут должно быть твое имя)