Correct the following sentences

He announced that he will take the plane to Dhaka.

= He announced that he would take the plane to Dhaka.

He knew Mr. Khan stopped smoking five years before. = He had known Mr. Khan had stopped smoking for five years.

This sentence requires correction based on the principle of subject-verb agreement.

The main subject of the sentence is "The basket," which is a singular noun. The phrase "containing ten apples" is a participial phrase acting as an adjective, modifying "basket." It does not alter the number (singularity or plurality) of the main subject.

Since the subject "basket" is singular, the verb must also be singular. The original sentence used "were," which is a plural verb. It should be replaced with the singular past tense verb "was" to agree with the singular subject.

None of us are perfect. = None of us is perfect.

On arriving in Dhaka, his friends meet him at the station. = When he arrived in Dhaka, his friends met him at the station

He said that the earth moves round the sun.

In reported speech, when the direct speech expresses a universal truth, a scientific fact, or a habitual action, the tense of the verb in the reported clause does not change, regardless of the tense of the reporting verb (e.g., 'said').

Even though the reporting verb "said" is in the past tense, the fact that "the earth moves round the sun" is an eternal truth. Therefore, its tense remains in the simple present tense ('moves') in the indirect speech.