I keenly felt the weight of his words.

He is struggling to understand the perfect tense in English.

She is struggling to understand the perfect tense in English.

For some reason, I can't convert this sentence.

This new software maintains upward compatibility with the old version.

He is a bit thickheaded, so he didn't notice her feelings.

He is suffering from aphasia as a sequelae of stroke.

We should recycle to prevent environmental pollution.

Have you ever had an indirect kiss with him?

A gap is created in the wall of the building due to the earthquake.