1. The hall was crowded with people watching the performance. The hall is full of people watching the performance.

2. Xiaoming's self-sacrificing behavior touched people around him. Revision: Xiaoming's behavior of sacrificing himself to save others touched people around him.

Improper collocation type:

1. At the panel discussion, everyone spoke fiercely. Revision: During the group discussion, everyone spoke enthusiastically.

Under the teacher's education, he made clear his learning attitude. Revision: Under the teacher's education, he corrected his learning attitude.

Incomplete component type:

1, everyone must pay attention to good hygiene habits. Revision: Everyone should form a good habit of paying attention to hygiene.

My brother likes playing basketball and football best. My brother likes playing basketball and football best.

Extended data:

Ill sentences are wrong sentences. Any sentence that violates the rules of grammatical structure or objective facts is a sick sentence. The former is called grammatical error and the latter is called logical error. Grammatical mistakes often occur.

The common types of ill sentences are: improper word order, improper collocation, incomplete or redundant components, disordered structure, unclear meaning, illogical, ambiguous, mixed sentences, improper classification, and one-sided (double-sided/single-sided).

Baidu encyclopedia-sick sentences