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1.The dog is one hand in length.

About this sentence, you may want to check out the info below.


A hand (or handbreadth) is a unit of length measurement, originally based on the breadth of a male human hand and now standardized at 4 inches (about 10 cm). When used to measure height, it is abbreviated "h" (for "hands") or "hh" ("hands high").[1]


A Catholic commentary on Holy Scripture‎ - 第 225 頁Bernard Orchard 著 - 1953 - 1312 頁

The former was a single piece of brocade of indeterminate length, ... one
handbreath in length and width, adorned on the outer side with twelve precious
...
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You may also try the sentence below.

" The dog is one handbreadth in length.


2.The time is approximately four o'clock. ( acceptable)

It is around four o'clock now. ( more natural)
or

The time is around four o'clock now.

The adverb" approximately" is mainly used in written English.

3.Mavis is very attached to her boyfriend. ( correct)

4.The hunter aimed at the cheetah and fired. ( correct)

5.Dancing enables you to keep fit.(You should use the simple present tense because it is a fact.)

Dancing helps you ( to = optional) keep fit. ( better)

6.Chang-Er is a goddess of an old legend.

7.You should seek a helper to help you. ( no grammatical mistakes)

You should get some help. ( simpler and more natural)

8.I have been fed up with watching TV here. ( correct)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If I have wrong,please tell me the expaination.<--Your sentence

Mistakes:

If I have made any mistake(s), please ( kindly) explain every mistake to me.

1) If I have wrong<--- wrong = adjective/verb Mistake!

2) please tell me the explanation( Be careful of the spelling!).<---------This sentence is wrong! You'd say " please explain (XXX= object) TO me".








2009-07-01 01:38:40 補充：
If you do not know what " one handbreadth" means, go to

http://en.wikipedia.org/wiki/Hand_(length).

There is a little picture on the right. ( Check out "2")

1.The dog is one-hand in length.(adjective)
2.The time is approximately four o'clock.
3.Mavis is very attached to her boyfriend.
4.The hunter aimed at the cheetah and fired.
5.Dancing enables you to keep fit.(FUTURE TENSE not suitable)
6.Chang-Er is a goddess of an old legend.(I guess just typing mistake)
7.You should seek a helper to help you.
8.I have been fed up with watching TV here.