1. Try to remember these tips.

2. Try to remember these peices of advice.
3. Try to remember the pieces of advice.
4. Try to remember these advices.
5. Try to remember these advice.
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Are #4 and #5 grammatical? What is similar to #1?

Omit 4 and 5.

Change 3 -- Try to remember this advice.

Change 2 -- Try to remember these pieces of advice.

#4 and #5 are not grammatical. In English, "advice" is an uncountable noun, so it does not have a plural form. Therefore, we cannot say "advices" or use "these" to modify "advice" in this way.

Similar to #1, both #2 and #3 are grammatically correct. They both use the correct countable form "pieces of advice" and "these" to modify it. So, you can use either #2 or #3 to correctly express the idea of remembering multiple pieces of advice.