* Incorrect verb tense: "Bade" is the past tense of "bid", which is used in the phrase "bid farewell". You're using the past tense incorrectly here.
* Unnecessary "us": The "us" is redundant since "let" already implies that the speaker is including themself.
Correct options:
* "Let's bid 2011 goodbye." This uses the correct verb tense and is a natural and concise phrase.
* "Let us say goodbye to 2011." This is grammatically correct but a bit more formal.
It's important to use the correct verb tense and avoid redundancy in your sentences for clear and effective communication.