Is there any rule in the adverb sequence?So Can I use quickly,clearly and hard at the begining of sentence,at the end of the sentence or at between subject and verb?Is it right?Adverb sequence is not important in the sentence?

"Hard" is not an adverb.

Adverbs do not have to modify verbs only.
In a sentence, they should be located close to the word they modify. You just can't stick them anywhere.

It would be easier to explain if you had an example.

Yes, there is a general rule for the order of adverbs in a sentence, although it is not a strict rule and can be flexible depending on the context. The typical order for adverbs is:

1. Manner: How an action is performed (e.g., quickly, slowly)
2. Place: Where the action takes place (e.g., here, there)
3. Time: When the action occurs (e.g., yesterday, now)
4. Frequency: How often the action happens (e.g., always, never)
5. Degree: The intensity or extent of the action (e.g., very, extremely)

For example, in the sentence "She quickly and clearly explained the concept.", both "quickly" and "clearly" are adverbs of manner, so they can be used together and placed before the verb "explained".

However, in the sentence "She clearly and quickly explained the concept.", the adverbs can also be reversed in order without significantly changing the meaning. This flexibility is because adverb placement is not always crucial to the overall meaning or comprehension of a sentence.

It's important to note that this general order is not a hard and fast rule, and you can deviate from it to emphasize or convey specific meanings. Context and clarity should guide the placement of adverbs in a sentence.