"Dw i'n gwisgo cot."

Translation: I'm wearing a coat.

[Matt_jadeth]

It probably has been mentioned on another comment, I just haven't seen it yet. But when do you use Dw i'n' and when do you use 'Dw i'. Diolch!

[ibisc]

This is introduced in the notes for the earlier section 'Present Tense 1'.

Dw i just means 'I am'. yn/'n is needed to link that to verb-nouns such as gwisgo, hoffi, etc and to adjectives such as oer, twym, etc. Yn has three main uses - see this