随便造个句子就行，周一就放在句首再加个逗号。或把周一放在句末，都可以。
Last Monday I had a good time。
last Monday I didn't have classes
last Monday I quarelles with my deskmate
last Monday I went to the park
last Monday I was unhappy
last Monday I climbed mountain
last Monday I helped my classmate who was in trouble
Next Monday I will go to the park。
Next Monday I will meet a friend。
Next Monday I will study Chinese。
Next Monday I will see a movie。
Next Monday I will play football。
Next Monday I will read that book。
Next Monday I will visit my grandfather。