Is it grammatically correct to use the word ‘and’ twice in a sentence? For example, does the following sentence read correctly:
“I have experience of training and supervising staff and consider myself to be an excellent leader and negotiator.”
Of course. Use the language to make sense, not to placate your misinformed 3rd grade English teacher.
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I'd say "experience in" not "of" but that could be a US thing.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
I'd use in too- of suggests that they have done it but not very much or very often.