WRITING AND SPEAKING HELP

You tend to struggle with PUNCTUATION, especially with the use of COMMAS, so you should practise a little bit.

GUIDE TO CORRECT PUNCTUATION.
 PUNCTUATION EXERCISES.
 THE CORRECT USE OF COMMAS EXERCISES.

Another source of mistakes is in the use of ARTICLES, both DETERMINE and INDETERMINE, so these exercises might be helpful for you:

THE USE OF ARTICLES REVISION.
EXERCISE 1.
EXERCISE 2.
EXERCISE 3.
EXERCISE 4.
EXERCISE 5.