let's look at some typical examples.

How would the previous sentence be correctly capitalized?
Answer: Let's look at some typical examples.
this tea chest is also suitable for boxes with loose tea (eg bradley's classic tea) because the compartments are removable.

How would the previous sentence be correctly capitalized?
Answer: This tea chest is also suitable for boxes with loose tea (eg Bradley's classic tea) because the compartments are removable.
in 1851 watson became a fellow of trinity college and from 1851 until 1853 he was a tutor in mathematics at cambridge.

How would the previous sentence be correctly capitalized?
Answer: In 1851 Watson became a fellow of Trinity College and from 1851 until 1853 he was a tutor in mathematics at Cambridge.
this allows the intelligence of windows to decide the correct software application to open your newplr file.

How would the previous sentence be correctly capitalized?
Answer: This allows the intelligence of Windows to decide the correct software application to open your NEWPLR file.