(a) I add some salt to / into the food. --- ok. ---ok (c) He is slicing a piece of cake / a the cake.
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Vincent Teo(a) I add some salt to/ intothe food. The simple present tense is not the most likely tense to use here.
(b) He eats with hishandhands/fingers.
(c) He is slicing a piece of cake / a cake. OK
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