To use the words of the correct type and position of words in a sentence. Must be correct in the sense meaning of the word. And must be spelled correctly.
Using the correct words according to their type and the position of the words in the sentence. Must be valid according to the meaning of the word and spell it correctly.
The use of words in accordance with the right of the word and the position of a word in a sentence to be correct in the sense of the word and must be spelled correctly.