| proficient in | He got very proficient in English in a few years. |
| proficient in | He is proficient in both Spanish and Italian. |
| proficient in | He is proficient in English. |
| proficient in | If he is proficient in English, I'll employ him. |
| proficient in | If he is proficient in English, I would employ him. |
| proficient in | Proficient in English, he is looked on as a good teacher. |
| proficient in | She is proficient in both Spanish and Italian. |
| proficient in | She is proficient in French. |
| proficient in | We are looking for someone who is proficient in French. |