Your friend asked you to be a partner in his new business

co-operation proposition

Dear Jill,
I hope you're well,I'm happy that you invited me to take part in your new business plan.
I have to say it's a great idea to run a fast food restaurant in main street around this area which accompany with lots of offices.People didn't have too much time for lunch it's a good choose for them.

Having said that ,I'm afraid I'm going to turn your offer down.As you know,I'm planning to buy a new house which means I need money to covert it .I don't think is a prefect time for me to get involved the project like this .Also,I'm working full-time job,I don't have extra time to commit to the restaurant.It's hard for me to make this decision.

Anyway,I Know you'll make a great job and big successful without me.Best luck for your restaurant.
see you soon
christy

Christy, I am not sure what kind of advice you anticipate from your post as you did not post the attendant question of the letter. It would be difficult to assess if you answered the requirement(s) of the question when I do not know what it asked. Having said that, on a general note, you did your best in drafting an informal letter which is typical of your post. However, I would like to remind you, in case you ignored it because you did not know, that formal letters must contain writer's address. There are some typos in the body of the letter which occurred probably because you did not proofread your write-up after drafting. ''...around this area which accompany with lots of offices''.''...didn't have too much time for lunch it's a good choose for them''. ''...to get involved the project like this''.

The first two expressions highlighted above were not properly structured while the last one needs the preposition 'in' to make a complete meaning. Finally, you should sign your letter out with phrases like 'Kind Regards' 'Best Wishes' and so on. Apart from the observations cited hitherto, I must say that you created a letter that have a good feel of informality