LÉPÉS 1Válassza ki a helyes lehetőséget
LÉPÉS 2Tegye az Önnek tetsző gyakorlatokat a Kedvencek közé
Don't use for in the sense of about. The chief use of for is to convey the idea of being in favour of. If we say that the teacher spoke for bad habits it's like saying that he/she spoke in favour of bad habits!
Use to to express motion from one place to another, use at to denote position.
Use for if the actual sum is mentioned, use at if the actual sum isn't given.
If the weight or measure follows the price, use at with the actual sum: That velvet is available at £5 a metre.
Use by (not from) after the passive form to show the doer of the action.