1. Tom is watering the flowers now. (The sentence is in the present continuous tense because of 'now', indicating an action happening at the moment of speaking.)
2. I am cooking every day. (The sentence is in the present simple tense because 'every day' indicates a habitual action. The verb 'am cooking' is incorrect, it should be 'cook' or 'am cooking' if it's a temporary action, but 'every day' implies habit, so present simple 'cook' is more appropriate. However, if the intention is to emphasize the ongoing nature of his cooking activities, 'am cooking' can be used. Given the context of the other sentences, the task likely expects the present continuous for actions happening now or around now, and present simple for habits. Re-evaluating: 'every day' strongly suggests present simple. Correcting to 'cook'.)
2. I cook every day. (The sentence is in the present simple tense because 'every day' indicates a habitual action.)
3. We are listening to his stories on Sunday. (The sentence is in the present continuous tense, implying a planned or ongoing activity on Sunday. Alternatively, 'listen' could be used for a habitual action on Sundays, but 'are listening' suggests a current arrangement or a focus on the present action.)
4. Jane is going shopping at the moment. (The sentence is in the present continuous tense because 'at the moment' indicates an action happening right now.)