cake ^可数名词

• She baked three cakes for the party.^{她为派对烤了三个蛋糕。}

biscuit ^可数名词

• He bought some biscuits from the bakery.^{他从面包店买了一些饼干。}

• They are typing these letters. ^{他们正在打这些信}
• They can type these letters. ^{他们能够打这些信。}

• She is making the bed. ^{她正在整理床铺。}
• She can make the bed. ^{她会整理床铺。}

• You are swimming across the river. ^{你正在游过河流。}
• You can swim across the river. ^{你能够游过河流。}

• We are coming now.
• We can come now.

• We are running across the park.
• We can cross / run across the park.

• He is sitting on the grass.
• He can sit on the grass.

• I am giving him some chocolate.
• I can give  him some chocolate.