at the age of 与by the time of 与at that time后面分别加什么时态?

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at the age of adv.在...岁
She graduated from the high school at the age of 18.
by the time是过去完成时的标志,看见这个标志,就一定要用过去完成时.
J-Lo Wants to Be Pregnant by the Time of Her 40th Birthday in July
at that time:是指在过去某段特定的时间,是特指 adv.在那时
Where were you at that time?你当时在哪里呢?

at the age of 与by the time of 与at that time后面分别加什么时态? by/at the age of分别使用什么时态 by the end,at the end of,in the end分别与什么时态连用 at the time of后加什么 at that time与什么时态连用? 请问一下at the age of 与 by the age of 的区别. all the time用什么时态与at present连用 at this time of year与 at this time of the year哪个对? "by the age of","at the age of"的区别? at the age of at the same time of at the time、at that time与at this time的语用含义