Grammar check does not check an before vowel sound rule

For example, if I write:

A animal was killet.

The spelling check suggests Killed instead of Killet. But it does not suggests An animal instead of A animal.

In MS Word for example the killet wrong word is usually marked in red and the An suggestion is marked in blue.

But LO just check orthographic erros not grammar ones.

Tks,
Douglas Chagas

Install LanguageTool.

It’s one of the best extensions.
https://extensions.libreoffice.org/extensions/languagetool