concentrate

to make an effort to focus

expresses an inability to focus

to usually or habitually focus on something

expresses an inability to focus

expresses that focusing is hard to do

expresses that focusing is hard to do

expresses that focusing cannot be done

to focus with great effort

to focus in the correct or required way

to give one's complete attention

to focus for the most part on something

to focus for the most part on something

to focus completely on only one thing

to focus with extreme effort or emotion

to focus with determined and eager attention

to focus especially on one thing

to focus for the most part on something

to focus on one thing, to the exclusion of others

to focus only on one thing and nothing else

to focus for the most part on something, often in a formal context

to focus only on one thing, for a single reason

the most common preposition used with concentrate, indicating the object of focus