He will come back by the by. = He will come back within a few minutes.

He wished that he had had wings of dove.

Heart and soul = Try heart and soul to better your result.

her guilt of

Her influence in on the wane, but she is still the boss.

Her performance is better than yours. (Positive) = Your performance is not as good as hers.

Hero = Heroes

Hipopotanmos = Hippopotamus

Hire = ভাড়া/মজুরি।

His action is contrary __to__ his words.

His pen has been stolen.   = Someone has stolen his pen.

How long have you waited for me?

How shocking news was to the nation!

Huge quantities of toxic chemicals and wastes is dumped into the river.  = Huge quantity of toxic.

I am ashamed of his conduct