1. Do you mind moving your foot?
2. Point your right foot downward.
3. I'm sorry (that) I stepped on your foot.
4. I'm sorry to have stepped on your foot.
5. I'm sorry to step on your foot.
6. I'm sorry that I step on your foot.
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Are they all grammatical? Do you use #5 and #6? is it better to delete 'that'?
1 through 4 are all correct. 5 and 6 have errors in the tense of the second verb.
1. Yes, all of the sentences you provided are grammatically correct, except for sentence #6. However, the usage and appropriateness of each sentence may vary in different contexts.
2. Sentences #3 and #4 are both correct and commonly used to express regret for accidentally stepping on someone's foot.
3. Sentence #5, "I'm sorry to step on your foot," is also grammatically correct. However, this form generally implies an intention to step on someone's foot and may come across as insincere or sarcastic.
4. Sentence #6, "I'm sorry that I step on your foot," is not grammatically correct. The correct form would be "I'm sorry that I stepped on your foot," indicating that the action already occurred in the past.
5. Regarding the use of "that," it is generally optional in sentences expressing regret or apology. Some people prefer to include it for clarity, while others prefer to omit it for more concise expression. Both versions are grammatically acceptable, so it ultimately depends on personal style and preference.