Why wrong: Gerunds, noun-verb hybrids ending in -ing are usually non-count or mass nouns. They refer to activities, such as shopping, driving or running. If you see a sign that says “No smoking” it means that the activity is forbidden there.
Mass nouns can’t be plural or take an indefinite article (a or an means one, which is a number). Sometimes, the same spelling can be used for a noun and a gerund (e.g. a building, a feeling or a meeting). For more information, click here.
Correct it: With gerunds, don’t use indefinite articles (a training) or try to make them plural (trainings). If you mean something short, say “I had some training or a training session this morning.” Before session, here training is used as an adjective. You had a session with that activity.
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