It is a main idea (thoughts) about your
topic. (student definition)
It is the container for the topic and is found at the
beginning and the end of a paragraph. Good definition!
A topic sentence is what you want to express
in your paragraph or essay. This is
closer to the truth. Just be sure you can express your idea
inside the structure.
A topic sentence must be supported.
Quite true. In fact, if you cannot support
your topic sentence it is time to adjust it so you can.
Sunny days in Vancouver are almost like a festival, since
they are quite rare.
May be hard to prove "rare," but not a bad topic sentence
Why do people think they can save money on their clothing in
This topic sentence needs work to clarify your ideas. You
must be clear with your reader at all times.
[Most] Everyone in Vancouver loves sunny days.
One cannot prove "everyone," so just qualify a bit and
everything is okay.
Summer in Vancouver is very beautiful, for there is often
lots of sunshine.
[Here is] Why Vancouver weather can help plants to grow.
Be careful of the difference between a topic sentence and a
title. This one was very close to a good title, so the words
"Here is" were added.
Vancouver’s weather is perfect, if you compare it with
weather in Yellowknife.
There is a sense of humour or joking tone in the above, which
can appeal to many readers.
Vancouver’s weather isn’t perfect.
Vancouver’s weather is pleasant.
I expect “pleasant” details. We could also say “is
temperate,” but this is awfully close to a fact.
Except in rain, Vancouver weather is very good.
This is personal opinion, so would need some kind of facts to
make it work.
A student asks, “Should I or can I use a question as my topic
Yes, you can and you may, but it is tricky and less often
used in North America, so avoid it mainly, unless you are sure
of a reader’s reaction. Probably it is safer to do it inside the
content than for the topic sentence.