One of the sub skills which are very difficult for the students is Grammar. While they are studying, they always try to simulate their native language grammar with the one they are learning. This is the first mistake. You must learn the new grammar rules as it is. Next try to use them in your daily conversation. You should also listen to native speakers and see how they use this grammar rule, practice always makes perfect, so try to write new sentences with the grammar rules you have learned .
https://www.varsitytutors.com/blog/7+tips+to+improve+your+grammar+skills
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