нельзя́
predicative
impersonal
it is impossible to, one cannot, you can't, there is no way to
сде́лать
do something
их нельзя́ останови́ть
it is impossible to stop them; there is no stopping them; they cannot be stopped
нельзя́ не согласи́ться с ва́ми
I cannot but agree with you
(не могу не согласиться)
нельзя́ не восхища́ться
one cannot help admiring
impersonal
it is prohibited / forbidden / not allowed to; one mustn't
де́лать
do something
прекрати́те куре́ние, здесь нельзя́!
stop smoking, it is not allowed, or is prohibited, here!
здесь кури́ть нельзя́
smoking is not allowed, or is prohibited, here; you may not smoke here; you must not smoke here
он челове́к, кото́рому нельзя́ доверя́ть, на кото́рого нельзя́ положи́ться
he is not a man to be trusted, to be relied upon / on
ему́, им нельзя́ пла́вать, бе́гать
he is, they are forbidden swimming, running ; swimming, running is forbidden him, them
(запрещено, так как вредно)
it is impossible to, one cannot, you can't
сде́лать
do something
нельзя́ ему́
it is impossible for him
сде́лать
to do something
it is prohibited / forbidden / not allowed to; one mustn't
де́лать
do something
one cannot
not an option
Проиграть нельзя́.
Losing is not an option.