The plan may well be over-ambitious, and is clearly open to discussion.
Council members are due to have informal discussions later on today.
Here, one sentence uses the singular form of discussion, while the other uses the plural form. I wonder how to use the right form of this word.
The first one is acting like an uncountable noun. It means an unspecified number of or schedule for comments. It means that comments are being accepted.
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The first one is acting like an uncountable noun. It means an unspecified number of or schedule for comments. It means that comments are being accepted. It doesn't necessarily imply that a conversation is going to happen. "Open to discussion" is a very common usage.
In the second one, the "discussions" are specific scheduled events. There are a definite number and time for those conversa