g.4.+ing

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• fishing

• 
• gardening

• 
• tidying room

• 
• skiing

• 
• dancing

• 

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• playing football

• 
• playing basketball

• 
• visiting friend

• 
• riding horse

• 
• cooking

• 

what's this

• skiing

• sking

• skating

• skatting

what's this

• skiing

• sking

• rideing horse

• riding horse

what's this

• They are riding horse

• He is riding horse

• We are riding horse

• I am riding horse

what's this

• danceing

• dancing

• rideing horse

• riding horse

what's this

• cookking

• dancing

• cooking

• riding horse

what's this

• visiting friend

• visitting friend

• cooking

• riding horse

what's this

• playing baseball

• playing basketball

• playing tennis

• playing football

what's this

(a)  

• He's playing tennis
• He's playing basketball
• They're playing tennis