Salam! You can follow verbs of perception (see, hear, watch, listen to) with either the base form or the -ing form of a verb. In many cases, there is no real difference in meaning. I think that this is one of those cases where you could use them pretty well interchangeably. There is a subtle difference, however. The base form suggests a single completed action, which is why Jesse says that "It would be nice to hear her sing" might suggest one particular song: heard in its entirety. Meanwhile, the -ing form suggests the action or process of singing. [NB The 'singing' of "I'd like to hear her singing" could also be interpreted as a verbal noun, as Kylie Alonso suggests. This is because of the ambiguity of the pronoun 'her'. But let's presume it's a verb here, as in "Would you like to hear me singing?" (verb) as opposed to "Would you like to hear my singing?" (noun).] Here's an other example which might be a little clearer: Compare, for example, "I heard you singing in the shower this morning" with "I heard Pavarotti sing at La Scala in 1983". The first sentence suggests that I walked past the bathroom door this morning and just happened to hear you while you were singing : this focuses on a few moments of an action that was in progress at a particular moment. By contrast, the second sentence refers to an entire concert which you heard from beginning to end. I hope that helps.

https://www.lexico.com/definition/sing https://www.lexico.com/definition/singing According to Lexico, the word "sing" has more possible meanings than the word "singing". In your sentences, they mean the same except "sing" is informal.

@Jesse @Kylie Thank you very much :)

You can pretty much use them interchangeably. If there is a difference at all, it might be something like this: 1. It would be nice to hear her singing (a general selection of songs). 2. It would be nice to hear her sing (a particular song).

They’re both grammatically correct, singing is a noun, so you would use this to talk about her singing in general, but if you want to hear her sing, which is a verb, then you should use the second sentence. 🤗