Can anyone point out the or a difference between saying comfortable doing sth and with sth?

You're right to notice a difference! Here's the breakdown:

* Comfortable *doing* something emphasizes the action itself. It means you feel at ease and confident while performing that particular activity.

* Example: "I'm comfortable *driving* in the city." (The focus is on the act of driving.)

* Comfortable *with* something emphasizes a general feeling of ease and acceptance about a situation, person, or thing. It suggests you're not bothered or anxious by it.

* Example: "I'm comfortable *with* the new software." (The focus is on accepting and being okay with the software's presence.)

Here's a table to summarize:

| Preposition | Emphasis | Example |

|---|---|---|

| doing | Action | I'm comfortable *giving* presentations. |

| with | Situation/Thing | I'm comfortable *with* being around large crowds. |

In practice:

* You wouldn't say "I'm comfortable *with* driving in the city." This implies you're okay with the fact that driving exists, not that you feel at ease while doing it.

* You wouldn't say "I'm comfortable *doing* the new software." This implies you're comfortable performing the software, not accepting it as a tool.

By understanding the subtle difference, you can communicate your feelings more precisely.