I carried my backpack.

> This sentence is correct.

I offer a candy to my friend.

> This sentence is correct.

I brought a backpack.

> This sentence is correct.

I fell because I did a bungee jump.

> This sentence is correct.

Don't follow the strager.

> Don't follow the (stranger)

> Be careful with your spelling.

I prepare to do a talk fun.

>Let's revise your sentence. 

TalkFun is the name of our  Online account. We can say like this:

> I am preparing my class in TalkFun.

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Hello Eric! ^^

       I am very happy that most of your sentences are correct. Keep up the good work. Be  careful when you are writing to avoid misspelling the words.

  See you next week and take care always. Have a happy weekend.

~Teacher Cassie