When do I use I AM DOING and WILL

When do I use I am doing? 

Which is the correct sentence in each pair?

a) I buy a computer because I need one.
b) I am buying a computer because I need one.

a)  I am getting a new camera for my birthday.
b) I get a new camera for my birthday.

 

We use the present continuous for unfinished actions:

• to describe what is happening now.
  I am doing a grammar exercise at this moment.
• with today, this week, etc…
  He isn’t working this week because he wants to paint his room.
• to describe what is happening around this time.
  We’re in London. We’re having a great time.
• to talk about definite future plans.
  I am pleased you are going to Rome next week.

In contrast, here are some examples of the use of the present simple:

• I do my homework every evening (regular habit)
• I work in an office (permanent state)
• We go to the doctor when we are ill (general truths)

We don’t usually use the continuous form of hope, know, like, love, need, want. 

 

When do I use I will? – KET

Which is the correct sentence in each pair?

a)  I see you next week.
b) I’ll see you next week.

a)  I’d love to go with you, but I can’t next week.
b) I’ll love to go with you, but I can’t next week.

 

We use will for things we decide now about the future:

• to make promises.
  I’ll be ready at two o’clock. (not I’m ready at two o’clock)
• to make offers
  If you like, I’ll meet you at the station. (not I meet you at the train station).
• after think and hope, and to make predictions.
  I think you’ll like my town. (not I think you like my town).
  It’ll be nice to see you again. (not It is nice to see you again).

We use shall I/we only to offer:

Shall I close the window? (not Will I close the window?). 

We use going to for things we have already decided:

I’m going to stay at home this evening and write some emails. (not I will stay at home).

We use would like/love/prefer when we say what we want to do:

I’d like to go to the cinema tomorrow. (not I will like to go).