"Dw i'n smwddio'r crys."

Translation: I am ironing the shirt.

[the3lusive]

Is this 'r used only after verbs ?

[areddragon]

'r is used in place of y/yr whenever the previous word ends with a vowel (meaning the).

[SamuelWolter]

So, would "I ironed the shirt" be "smwddiais i'r grys?"