I baked a cake. Lettuce is a mass noun meaning a determiner a/an is not used. So we have to use a head of, a piece of, etc.
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Paco2004"Lettuce" is countable before being served at the eating table, but uncountable when you eat.
(EX) They grow cabbages and lettuces in the field.
(EX) Do you prefer lettuce in your salad, or cabbage?
"Cake" is countable before being cut into pieces but after then it is uncountable.
(EX) Mother is baking a cake for my birthday.
Paco2004Hello My2sensesHorrible at arithmetic but the plural of lettuce is lettuce. I can count 1 head of lettuce, 2 heads of lettuce and so on.
Whatever kind of lettuces they are, I can count lettuces, saying "one lettuce, two lettuces, three lettuces, ...". It would be because I am good at arithmetic. How about you?
paco
My2senseHorrible at arithmetic but the plural of lettuce is lettuce. I can count 1 head of lettuce, 2 heads of lettuce and so on.You can count lettuces that way. But I would come to get a HEADache when I hear it.