couldn't manage to
Tom no lograba entender lo que estaba pasando.
Tom couldn't understand what was happening.
Tenía su nombre en la punta de la lengua, pero no lograba recordarlo.
I had his name on the tip of my tongue, but I couldn't remember it.
Me preocupaba y no lograba dormirme.
I was worried and couldn’t fall asleep.
No lograba encontrar a mi gata Rainbow.
I couldn't find my cat Rainbow.
— Los muertos no mueren (2019)
Quiero decir, que su pene no lograba una erección.
I mean, his penis couldn't get an erection.
— The Chaser (2008)
Me preocupaba y no lograba dormir.
I was worried and couldn’t sleep.
Él no lograba entender la frase.
He couldn't understand the sentence.
Mary no lograba encontrar una frase adecuada para el final de su novela.
Mary couldn't find a suitable sentence for the ending of her novel.