This is Part 4 of Reading and Use of English: six separate items, each with a sentence, a keyword in capitals and a gapped second sentence. You fill the gap with 3-6 words so that it means the same as the first.
You must use the keyword without changing it, and it counts as one of your words. Each answer usually combines grammar and vocabulary, such as a passive, reported speech, a conditional, 'wish', a comparison, a phrasal verb or an idiom.
The keyword must appear exactly as given: if it's 'LOOK', you can't write 'looked' or 'looks'. Build the rest of the answer around it, because it's usually the heart of a phrasal verb, a fixed expression or a grammar structure.
Stay inside the word limit, keyword included, and remember that contractions count as two words: 'didn't' is 'did not'. The simplest habit is to write every form in full. An answer that goes over the limit gets no marks, however good it is.
Your sentence has to say exactly what the original says, nothing more and nothing less. Keep the same tense and time, the same people (if the original names Maria, don't switch to 'she'), the same negatives and the same strength: 'quite' is not 'very'.
Compare the two sentences and set aside the words they already share. What remains is the part to rephrase, and it usually involves a grammar change and a vocabulary change together, for example active to passive plus a new verb pattern after the keyword.
In the exam, each answer is usually marked in two halves, with one mark for each correct part. A partly right answer can still earn a mark, so never leave a question blank.
In this app, your answer is checked as a whole against the accepted answers, so always aim for the complete version.
Some changes come up again and again: active to passive, direct to reported speech, 'so' and 'such', 'too' and 'enough', 'unless', 'wish' and 'if only', 'it is time', comparisons and verbs with fixed prepositions.
The higher the level, the more you'll also meet inversion ('Not until...', 'No sooner...'), cleft sentences ('What I need is...') and idiomatic phrases built around the keyword.