1.
Jane:  I use the computer.
Correct: I am using the computer. / I used the computer. / I will use the computer.
Explanation/s: The tense of a verb shows the time when an action or condition occurred. In English the tense also may provide emphasis and may determine whether or not an action or condition was continuous or repetitive. There are three basic tenses: present (I am using), past (I used) and future (I will use).


2.
Jane: my camera is colorful.
Correct: My camera is colorful.
Explanation/s: Capitalize the first letter of your sentence.

3.
Jane: I Like cellphone.
Correct: I like cellphones.
Explanation/s: Since, you are talking about the general use cellphones.

*Hello, Jane! Thank you for submitting your homework. Please read the following corrections and explanations carefully. If you have questions and clarifications, you can ask me in our class. Thank you!