Text: herbs, such as oregano, thyme or rosemary

Correct capitalization: Herbs, such as oregano, thyme or rosemary

Text: but she thought to herself: what nonsense he talks! as if he could do anything but sit in the water and croak with the other frogs, or could possibly be any one's companion.

Correct capitalization: But she thought to herself: What nonsense he talks! As if he could do anything but sit in the water and croak with the other frogs, or could possibly be any one's companion.

Text: clean drinking water is essential for a higher standard of living.

Correct capitalization: Clean drinking water is essential for a higher standard of living.

Text: we know nothing about what isaac learnt in preparation for university, but stokes was an able man and almost certainly gave isaac private coaching and a good grounding.

Correct capitalization:
We know nothing about what Isaac learnt in preparation for university, but Stokes was an able man and almost certainly gave Isaac private coaching and a good grounding.