Learn English – How to use “qualified”

"However" is a rather versatile word, and its placement in a sentence can have a difference in meaning.

• It can go at the start:

However, a sentence can change in meaning depending on word placement.

This "however" is similar to a "despite this/that" and should always be followed by a comma.

• It can go at the end:

A sentence can change in meaning depending on word placement, however.

This is a variation on the first structure. The "however" could be replaced with a "though". It should always be preceded by a comma.

• It can go in the middle (or elsewhere):

A sentence, however, can change in meaning depending on word placement.

Again, this is similar to the first construction. It can be more emphatic. Like the second, it is used similarly to a "though". It should be preceded and succeeded by a comma.

• It can go in the middle (or elsewhere) with a different intention:

Sentences convey meaning; however, this meaning can change depending on word placement.

This "however" is used like a "but" and the general practice is to precede it with a semicolon and end it with a comma.

So you can be quite flexible with the use of "however"; however, (see what I did there?) it is not a bad idea to limit how often you use it to avoid repetition.

If something is very important to somebody, it means that that person feels themselves that it is important, contrary (or fittingly) to what other people thing.

Schoolwork is very important to Bob, as he wants to become a doctor.

Saying something is important for somebody or something means that the thing is important in order for something to be completed, so

Schoolwork is very important for Bob to become a doctor.

Saying Something is important for somebody to do something makes perfect sense, "Doing homework is important for Bob to become a doctor"

You used the word that correctly, although it isn't always required, It makes sense to say "It's important to me for you to be here", or you could say "It's important to be that you are here"