Grammar Check: 'Please bear with us, and I will start preparing these samples for you once they are all ready.'

The sentence 'Please bear with us, and I will start to prepare these samples for you once it all ready' contains a grammar error. The correct sentence should read: 'Please bear with us, and I will start preparing these samples for you once they are all ready.'

The original sentence has a few issues:

1. Incorrect Tense: 'It all ready' should be 'they are all ready.' The pronoun 'they' refers to the 'samples,' which are plural. The verb 'are' should be used with a plural subject.
2. Comma Usage: The comma after 'us' is correct, but a comma should also be placed after 'with us' to separate the two independent clauses. This creates a more formal and grammatically correct sentence.
3. Redundancy: The phrase 'to prepare' is redundant after 'start preparing'. You only need one of these verbs.

By correcting these errors, you create a clear and concise sentence that is grammatically correct and easy to understand.