Common Mistakes : Concentrate

verb

.BAD: I am concentrated on both speaking and writing
.GOOD: I am concentrating on both speaking and writing

.BAD: A bus driver has to be concentrated and should not speak to the passengers
.GOOD: A bus driver has to concentrate and should not speak to the passengers

: concentrate (on sth ) NOT be concentrated
How can children concentrate on their homework when they have one eye on the television

: Compare
.The juice is then concentrated by a process of evaporation

.BAD: The teaching tends to concentrate in grammar
.GOOD: The teaching tends to concentrate on grammar

.BAD: I try to concentrate in one subject at a time
.GOOD: I try to concentrate on one subject at a time

: (concentrate on sth (NOT in
.She gave up teaching so that she could concentrate on research

.BAD: I couldn’t concentrate myself as there was someone talking
.GOOD: I couldn’t concentrate as there was someone talking