Modal Verbs

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ADVICE

SHOULD + INF

OUGHT (NOT) TO + INF (más formal)

HAD BETTER + INF (tiene mala consecuencia sino sigues el consejo)

OBLIGATION

MUST + INF (Obligación interna, contigo mismo)

HAVE TO + INF (Fuerte obligación externa)

NEED TO + INF (Obligación leve)

LACK of OBLIGATION

DON'T HAVE TO + INF

DON'T NEED TO + INF

NEEDN'T + INF

PROHIBITION

MUSTN'T + INF

"REGRETS"

SHOULD HAVE + PP

OUGHT (NOT) TO HAVE + PP

NECESSITY

HAD TO + INF

NEEDED TO+ INF

LACK of NECESSITY

DIDN'T HAVE TO + INF (Y no lo hice)

DIDN'T NEED TO+ INF (Y puede que lo hiciera o puede que no)

NEEDN'T HAVE TO + PP (Pero lo hice)

ABILITY

GENERAL SITUATION

+ COULD + INF

- COULDN'T + INF

PARTICULAR SITUATION

WAS/WERE ABLE TO + INF

+ MANAGED TO + INF

SUCCEEDED IN + ING

- COULDN'T + INF

MODAL VERBS