sorry, MetroPole, ale musze wytknac kilka bledow, ktore moga zawazyc na ocenie twojej pracy:
>...join you? I DID maths for the past two hours and I think a bit of fresh air WILL DO me good.
I HAVE BEEN DOING maths for the past two hours and...
jezeli czynnosc trwa do chwili obecnej, lub wlasnie/dopiero co sie zakonczyla, uzywamy czasu Present Perfect Continuous - w powyzszym zdaniu zasadnicza role odgrywa okolicznik czasu, 'for the past two hours' (przez ostatnie dwie godziny)
>...suitcase! If I MISS this train, I HAVE to whait two hours for the next one!
If I miss the train, I WILL have to WAIT...
oprocz uzycia formy 'will' mozna owe prawdopodobienstwo zmniejszyc uzywajac czasownikow modalnych 'may' badz 'might'...
>4. When they eventually 'WILL REACH' (tu powinno byc reached) the village, they 'WERE' exhausted.
Rowniez mozna to zdanie zobrazowac w czasie przyszlym:
When they eventually REACH the village, they WILL HAVE BEEN/WILL BE exhausted.
>6.This postcard 'has just arrived'. She 'SPENDED' (NIE, zobacz niereg. czasown. pownno byc spenT) her holidays in the Caribbean and I guess she ENJOYED (czas przeszly) it very much.
Osobiscie uzylbym tutaj takich konstrukcji:
...just arrived. She IS SPENDING her holiday in the Caribbean and I guess she IS ENJOYING it very much.
>7. The Bonnets STILL DRIVE their old car. They TRY to sell it for weeks, but they DIDN'T FOUND anyone who WANTS to buy it.
Tutaj po raz kolejny, moim skromnym zdaniem, mamy do czynienia z czyms, co wprowadza nam uzycie innego czasu, niz uzyla terri:
...old car. They HAVE BEEN TRYING to sell it for weeks, but they HAVEN'T FOUND anyone who WANTS to buy it.
Uzycie czasow perfect podkresla nam sytuacje, ktore maja miejsce 'od tygodni' az po dzisiejszy dzien
>9. A: I really hope we GOING PAINTING the house by this time tomorrow.
tutaj raczej uzylbym future perfect:
...hope we WILL HAVE PAINT the house by this time tomorrow.
>...it GOING 'RAINING' (to rain)
...it IS going to rain...
>10....When she SAW my boots, she KNEW at once we WALKED in the marsh again because I FORGOT to clean them up before coming home.
bardziej poprawnie '...she KNEW at once we HAD BEEN WALKING in the marsh again because I FORGOT...'