Добрый вечер. с предложением. его надо перевести. dykes are generally much longer than they are wide. most dykes occupy cracks and have straight parallel walls. заранее !

Дайки, как правило, намного длиннее, чем они широкие. Большинство дамб занимают трещины и имеют прямые параллельные стены.

1. We have been in this store for 20 minutes, and we haven't bought anything yet.

Здесь используешь Present Perfect Continious.

2. What is he doing? - He is playing tennis. - How long has he been playing tennis? - 2 hours.

Здесь используешь Present Perfect Continious и Present Continious.

3. They have been traveling for two weeks and have called two times (or twice for example).

Здесь используешь Present Perfect Continious.

4. Where is Molly? - She is ill. - How long has she been ill? - She is been ill since Thursday.

Здесь используешь Present Perfect Continious.

Sam and jane will have a party tomorrow. they invited a lot of their friends. they have  been preparing since yesterday. they have already  washed the windows and cleaned the carpets but they still  haven't bought products and a cake. since early morning they have been decorating the house by flowers. they have already decorated two rooms and they are going to end all the work tonight.  sam and jane know each other since their childbourhood. they have been married for ten years. in this house they live for  three years and they like it very much. they planned to have a dog for six months, but didn't decide which of breed. they were in shelter of stray dogs several times. they love one puppy and they probably are going to  take it soon.  немного не  уверена в правильности перевода, но все же.