1. He enjoys jogging in the morning.
2. He enjoys jogging in Monday morning.
3. He enjoys jogging on Monday morning.
[Do we have to use #1 or #3? What about #2?]
1 and 3 are fine. 2 is not used.
i need help: Lesson 3: Elements of Literary Nonfiction CE 2015
Language Arts 8 A Unit 3: Facts and Visions answers.
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In terms of grammatical correctness, both sentence #1 and sentence #3 are correct. Sentence #2, however, contains an error because we usually use "on" to indicate a particular day of the week.
To choose between sentence #1 and sentence #3, it depends on the intended meaning. If the intention is to convey that he generally enjoys jogging in the mornings, you can use sentence #1: "He enjoys jogging in the morning." This sentence implies that he enjoys jogging in the morning as a regular habit, without specifying any particular day.
On the other hand, if the intention is to express that he specifically enjoys jogging on Monday mornings, you should use sentence #3: "He enjoys jogging on Monday morning." This sentence specifies that he enjoys jogging only on Monday mornings.
Ultimately, the correct choice between sentence #1 and sentence #3 will depend on the intended meaning or context of your statement.