Definition
le costará mucho (entender)
:he/she will struggle to (understand), will have a hard time (understanding)
Pronombres CIThe verb costar uses a structure similar to that of gustar: pronoun + costar + second verb.
costará (mucho dinero)
:it will cost (a lot of money)
costar, futuro- "Si no se levanta pronto, le costará mucho dormirse por la noche"
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