补充：
权威在这里：
应AJAX要求，我来少少解释。
不妨设置几个角色。这个做飞行员的叫阿呆，今年40岁。他有个老爸。我们为每个句子设置个场景。
一、以下这几个是基本时态，应该没什么悬念。
1.一般现在时:he is a pilot.
2.一般过去时:he was a pilot.
3.一般将来时:he will be a pilot.
9.现在完成时:he has been a pilot.（一直做了10年飞行员直到今天。）
二、这几句不妨一说：
场景：老爸对邻居说：10年前，就是阿呆30岁时，我就预言他会做飞行员。他会这么说：
4.一般过去将来时:he would be a pilot.（10年前是过去，那之后就是过去将来。）
场景：老爸对邻居说：10年前，我搬到这里，在那之前，阿呆就做了10年飞行员了。他会这么说：
10.过去完成时:he had been a pilot （for 10 years）(10年前搬家，过去时。此前持续10年，过去的过去。即阿呆20岁开始开飞机，直到30岁搬家还在开).
场景：老爸对邻居说：阿呆30岁开飞机，现在40，再过10年，他50岁时，就整整开了20年飞机了。他会这样说：
11.将来完成时:he will have been a pilot (for 20 yrs by then)（50岁是将来。这个将来之前，一直开了20年。）
场景：老爸对邻居说：20年前，我就预见阿呆在自己30岁时，就已至少开了5年飞机了。他会这样说：
12.过去将来完成时:（i predicted）he would have been a pilot (for a least 5 yearsbefore his 30) （20年前是过去，10年后阿呆30岁，是将来时，30岁前一直开5年，用完成时。）
三、一下这几种，完全可以用简单时态取代。
be serving as那几句是为了凑足时态造的句子。虽然没有大错，但总归叠床架屋，如果不是有特别的需要，比如强调语气，我想一般不会有人这么说。
另外，这里大概只能用serve这个词。表示“做。。。”，以用系动词为主。但出现be being是不妥的，很古怪。我看到有人用becoming。这虽然避免出现be being，但be becoming形为现在时而实有将来时之意（解作：将来会成为）。实意动词里我只想到serve （as）这个字，在这里是很恰当的。
总而言之，我相信很少人会费劲说这么拗口的句子：
5.现在进行时:he is serving as a pilot.（可直接以he is a pilot取代之）
6.过去进行时:he was serving as a pilot (then)（可直接以he was a pilot取代之）
7.将来进行时:he will be serving as a pilot.（可直接以he will be a pilot取代之）
8.过去将来进行时:he would be serving as a pilot.（同理）
13.现在完成进行时:he has been serving as a pilot (for ten years) （此句以下，皆可做相应取代）
14.过去完成进行时:he had been serving as a pilot (for ten years by then)
15.将来完成进行时:he will have been serving as a pilot (for ten years before his 60)
16.过去将来完成进行时:he would have been serving as a pilot (for ten years if he began it at his 23.)（可直接以he would have been a pilot取代之）
1.一般现在时 he is a pilot.
2.一般过去时 he was a pilot
3.一般将来时 he will be a pilot.
4.一般过去将来时 he would be a pilot.
5.现在进行时 he is becoming a pilot.
6.过去进行时 he was becoming a pilot.
7.将来进行时 he will be becoming a pilot.
8.过去将来进行时 he would be becoming a pilot.
9.现在完成时 he has become a pilot.
10.过去完成时 he had become a pilot.
11.将来完成时 he will have become a pilot.
12.过去将来完成时 he would have become a pilot.
13.现在完成进行时 he has been becoming a pilot.
14.过去完成进行时 he had been becoming a pilot.
15.将来完成进行时 he will have been becoming a pilot.
16.过去将来完成进行he would have been becoming a pilot.
1.一般现在时：主动：the
boy
writes
a
letter.被动：a
letter
is
written
by
the
boy.
2.现在进行时：主动：the
boy
is
writting
a
letter.被动：a
letter
is
being
writting
by
the
boy.
3.一般将来时：主动：the
boy
will
write
a
letter.被动：a
letter
will
be
written
by
the
boy.
4.一般过去时：主动：the
boy
wrote
a
letter.被动：a
letter
was
written
by
the
boy.
5.过去进行时：主动：the
boy
was
writting
a
letter.被动：a
letter
was
being
writting
by
the
boy.
6.现在完成时：主动：the
boy
has
written
a
letter.被动：a
letter
has
been
written
by
the
boy.
7.现在完成进行时：主动：the
boy
has
been
writting
a
letter. 被动：a
letter
has
been
being
written
by
the
boy.
8.过去完成时：主动：the
boy
had
written
a
letter.被动：a
letter
had
been
written
by
the
boy.
这就是8个基本时态，造句的话可以像这么用，注重的是他们的结构。但实际应用时都应该有具体的时间状语和语境，可以多做时态的题感受一下。谢谢！
过去时:He was a pilot.
现在进行时:He is being a pilot.
现在完成时:He has been a pilot.
过去完成时:He had been a pilot.
一般将来时:He will be a pilot.
过去将来时:He would be a pilot.
还有什么时态么。。一下子想不起来了。。。记得我会继续发的。。。
1. He is a pilot.
2. He was a pilot 3 years ago.
3. He will be a pilot later, I think.
4. He is always dreaming of being a pilot.
5. He was always dreaming of being a pilot when he was young.
6. He has been a pilot for 5 years.
7. He had been a pilot for 5 years by the end of last year.
8. He said he would be a pilot one day.
9. He has always been dreaming of being a pilot.
10. He had always been dreaming of being a pilot until just then.
11. He will be considering being a pilot when he visits the airport tomorrow.
12. He will have been a pilot by the end of next year.
13. He will have been dreaming of being a pilot until he is graduating from the university 5 years later.
14. I thought he would be dreaming of being a pilot at this time the next year.
15. I thought he would have dreamt of being a pilot by the end of the next year.
16. I thought he would have been dreaming of being a pilot until he was to graduate from the university 5 years later.
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