Мy brother doesn't know how to use a computer but he wants to learn

Every Saturday Betty goes to a restaurant but this Saturday she stayed at home.

Hey, kids. What do you do?

We surfing the Net

I need some help in the kitchen

Ok, we coming

in my room. I downloading songs from the net

Chris always helps his mom with homework

At the moment she is cleaning the windows

Ответ:

1. My brother doesn't know how to use a computer but he wants to learn. (Present Simple - речь о постоянном действии)

2. Every Saturday Betty goes to a restaurant but this Saturday she will stay at home. ( В первой половине предложения Present Simple, говорим о постоянном действии; во второй Future Simple - действие будет ещё). Her cousins from Canada are visiting her. (Present Continuous - запланированное действие).

3. Hey, kids. What are you doing? ( Present Continuous - действие происходит в момент речи, мы это видим сейчас)

В: We are surfing the Net. (Ответ в том же времени, в котором был вопрос)

А: I need some help in the kitchen. ( Слово need - в Present Simple, хотя действие в момент речи. К need НЕ нужно+ окончание - ing)

OK, we're coming.

4. Where are you?

B: In my room. I'm downloading songs from the Net. ( из контекста видно, что действие - в момент речи)

5. Chris always helps her mum with the housework. At the moment she is cleaning the windows. ( В первом предложении речь идёт о постоянном действии, во втором - в момент речи)

Объяснение: