Yes, other grammatical elements and lexical forms can also be considered future tense markers. For example, in English, the present progressive tense (e.g. "I am going to the store") and the future tense (e.g. "I will go to the store") are both used to indicate future events. Additionally, certain adverbs such as "tomorrow" and "next week" can also signal future time reference.
In Chinese, besides the modal auxiliaries HUI and YAO, there are other grammatical elements that can indicate future tense, such as the aspect particle ZAI (在) and the verb LE (了). There are also certain lexical forms that can express future time reference, such as the verb JIANG (将) and the noun MINGTIAN (明天), which means "tomorrow".
Therefore, while modal auxiliaries like HUI and YAO may be the