"We hear the man."
Translation:Cloisimid an fear.
After 'an' in the nominative case, feminine nouns take a séimhiú (sounds like 'shayvoo'); masculine ones don't. It's one of the ways you can recognize which words are which gender, so you should always learn the article with the noun. an fhéasóg - fem. an pláta - masc an leabhar - You can't tell from this because you don't lenite l, so you have to look it up. (It's masc.)
In the present tense of standard written Irish, the synthetic form is preferred for both first person singular and first person plural. In the present tense of spoken Irish for both first person singular and first person plural, the synthetic form is preferred in Munster Irish, and the analytic form is preferred in Connacht Irish and Ulster Irish.
You need to USE them. Talk to your cat. Make up sentences and write them on a whiteboard or chalkboard. Talk to yourself. Join an internet group for beginners, post your sentences there, and ask for corrections. (But don't believe everything you hear--there area lot of people who know NOTHING but are very eager to share!)