Ability, construction -A OL-

The main construction for ability, "verb-A OL-", is formed with the present gerund of the verb followed by the auxiliary verb ol- (root meaning: 'to take'), which can in turn be conjugated like any verb for tense/aspect meanings.
The present gerund is itself formed by adding to the verb stem the suffix -A (verb stems ending in a consonant) or -Y (verb stems ending in a vowel)

With the verb kelmoq, 'to come', ending with a consonant, and in the present-future:

kela olamanI can come
kela olasanYou can come
kela oladiHe/she/it can come
kela olamizWe can come
kela olasizYou can come
kela oladilar / oladiThey can come

With the verb ishlamoq, 'to work', ending with a vowel, and in the present-future:

ishlay olamanI can work
ishlay olasanYou can work
ishlay oladiHe/she/it can work
ishlay olamizWe can work
ishlay olasizYou can work
ishlay oladilar / oladiThey can work

The negative is formed by adding the negative suffix -MA to the auxiliary verb ol-.

kela olmaymanI can't come
kela olmaysanYou can't come
kela olmaydiHe/she/it can't come
kela olmaymizWe can't come
kela olmaysizYou can't come
kela olmaydilar / olmaydiThey can't come

In spoken Uzbek, the present gerundive suffix -A is dropped and the two components are pronounced as a single verb.
This is not the case for the suffix -Y in verbs ending with a vowel.

kelolamanI can come
kelolasanYou can come
keloladiHe/she/it can come
kelolamizWe can come
kelolasizYou can come
keloladilar / keloladiThey can come

Same thing for the negative form.

kelolmaymanI can't come
kelolmaysanYou can't come
kelolmaydiHe/she/it can't come
kelolmaymizWe can't come
kelolmaysizYou can't come
kelolmayadilar / kelolmaydiThey can't come