are these two sentences grammatically correct ?
1- retirement shouldn't be an unhappy time.
2- retirement mustn't be an unhappy time
and if they both appear in a choose exercise , which one is preferred?
Both sentences must begin with a capital letter and end with a full stop: 1. Retirement shouldn't be an unhappy time. 2.
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Both sentences must begin with a capital letter and end with a full stop:
1. Retirement shouldn't be an unhappy time.
2. Retirement mustn't be an unhappy time.
Both are grammatically correct, but in practice (1) is much more likely to be used. What are the instructions of the exercise, exactly as written?