To + verb ing but why here ?

Isn't it a typo? I think it should be "commitment to improving basic skills".

paco

yes . but after to follows infinitive but here is ing ?

Commitment (=involvement) takes <to a noun> as its comlement. (EX) "US commitment to women in Iraq"

paco

improving here is not a verb - do you mean it ?

An -ing is either a gerund or a present participle. A gerund is treated as a kind of noun.

paco

paco - could you give me a link where I can check my grammar doubts ?

Please tell me what doubt you have.

paco

Mr Wells welcomed ministers' commitment to improving basic skills.

This is the correct sentence. Ok

but to the best of my knowledge I know that after "to" the verb is with infinitive.

So I think that the sentence must be Mr Wells welcomed ministers' commitment to improve basic skills.

After deep thninking I start doubting because welcome

First of all, I'd like to say "to" is used in various ways. The basic meaning of "to" is "towards" or "in the direction to". You can say "I went to Sofia yesterday" but please note that "Sofia" is not a verb.

The noun phrase of <X's commitment to Y> comes from a sentence <X is committed to Y>. "Ministers are committed to the improvement of English education" can be nominaliz

to the best of my knowledge I know that after "to" the verb is with infinitive.

Sorry. It's not true that the verb form after "to" is always the bare infinitive. The "-ing" form is also possible!