A supporting signal is a word or phrase that shows agreement or provides additional information to support an idea in a sentence. In the given options:
- "Although" is a supporting signal because it introduces a contrasting or contradictory idea that supports the main argument.
- "And" can also be a supporting signal as it adds more information to reinforce the main point without introducing a contradiction.
- "However" and "But" are not typically considered supporting signals; instead, they usually signal a shift in the argument or present a contrasting idea that challenges the main point.
Therefore, among the options provided, "Although" and "And" are examples of supporting signals.
