posted by Henry2 .
1) Do you say "a packet or a box of washing powder"?
2) Is it possible to use the word "washing-up liquid"?
3) They don't smoke or cut down on cigarettes because they know they harm our health (??) They are harmful
I'll give you American English terms. I'm not sure of British English terms for these things.
1. ... a box of detergent.
2. ... dish-washing soap
... dish-washing liquid
3. The antecedents for the different uses of "they" need to be clarified.
People don't smoke or cut down on cigarettes because they know that cigarettes harm their health. Cigarettes are harmful.