1
The pigs are playing in the mud.
To sign this sentence, start by signing 'PIG' under your chin, then sign 'PLAY' using both 'Y' hands, and finish with the two-handed squishing sign for 'MUD'. This sequence clearly sets up the subject, the action, and the messy environment they are enjoying.
2
My shoes are covered in mud.
Begin by pointing to your shoes or signing 'SHOE', then use the sign for 'MUD'. To show that they are completely covered, you can use an exaggerated, disgusted facial expression while making the squishing motion slightly larger to emphasize the sheer amount of mess.
3
Don't track mud into the house!
First, sign 'MUD' to establish the messy topic. Then, sign 'BRING' moving toward your body, followed by the sign for 'HOUSE'. Finally, shake your head firmly or use the sign for 'NO' to give a clear, commanding instruction that the dirt should stay outside.