jīntiān bā diǎn bàn de diànyǐng piào bǐjiào piányi, bié chídào.

的 links an attributive (modifier) to a noun. Here, the whole time phrase modifies the noun that follows:

• [今天八点半] + 的 + [电影票] = “the movie tickets for the 8:30 showing today.” Time, place, clauses, and adjectives can all use 的 to modify a noun in Chinese.

In Chinese, many adjectives can act as predicates without 是. You typically add a degree adverb (like 很/挺/比较) before the adjective:

• 今天八点半的电影票比较便宜. (natural)
• 电影票很便宜. (natural)
• 电影票是便宜… (usually only used in a contrast, e.g., 电影票是便宜，可是座位不好.)

When you talk about tickets in general, you don’t need a measure word. If you count them, use 张:

• General: 电影票比较便宜。
• Counting: 今天八点半的电影票一张/两张比较便宜。

Yes, if needed for clarity. Put it before 点:

• 今天晚上八点半的电影票比较便宜。 Word order inside the modifier typically goes broad → narrow: 今天 → (上午/下午/晚上) → 八点半 → 的 → 电影票.

Not required. Chinese often relies on parataxis (placing clauses side by side) to show cause → result:

• 今天八点半的电影票比较便宜，(所以)别迟到。 Adding 所以 makes the logic explicit but isn’t necessary.

Imperatives often omit the subject; it’s understood from context (usually “you/you all”).

• You can add it for clarity or emphasis: 你别迟到 / 你们别迟到 / 我们别迟到吧 (let’s not be late).

Yes, if context makes “movie tickets” clear:

• 今天八点半的票比较便宜 is fine in a movie-ticket context. Without context, 电影票 is safer.

的 is used to attach modifiers to nouns or to nominalize. Here, 便宜 is a predicate adjective, so no 的:

• Predicate: 电影票比较便宜。
• Attributive: 比较便宜的电影票 (“relatively cheap movie tickets”).
• Sentence-final 的 can add a soft, explanatory tone: 电影票很便宜的 (they really are cheap, you know).