"One of the distinctive features of academic writing is the use of relatively formal words which are neither informal lots of
many (colloquial) nor extremely formal fathomable
understandable (literal). After all, the academic writing should be clear, easy-to-read, and accessible. Complex sentences should have no more than one subordinate clause or central point. Short and active sentences for the most part are preferable to overly complicated and passive ones."

Now the following (informal) words are those which were wrongly used by other IELTS candidates. Can you match them with more suitable word choices for essays.

big changes

Choose significant changes tremendous changes