So that your writing won't be boring and put all of your readers to sleep...
syntax
It means it must be grammatically correct. The word spellings and the structure should be correct too.
a sentence with the word variety
You can say, "With whom did he leave"
You need 1 capital letter 2 proper sentence structure ( subject noun, verb) 3 end mark
Sentence Structure
A prepositional sentence opener is when a sentence begins with a prepositional phrase, which typically includes a preposition and a noun. This type of structure adds variety to sentence structure, provides important information about time, location, or manner, and helps create a smooth flow in writing.
You can use a question within a sentence by incorporating it as part of the sentence structure, such as at the beginning or end. For example, "Can you tell me what time it is?" or "I wonder if you know where my keys are?" This adds variety and engagement to your writing or conversation.
A sentence must contain a subject and a verb to be considered grammatically correct. If a group of words lacks this structure, it is not a complete sentence. It may be a sentence fragment, a phrase, or a list.
kinds of sentence according to structure
means to change the structure of sentence
Yes, starting a sentence with "then" is grammatically correct, especially when showing a sequence of events or actions. However, it is usually used sparingly to avoid overuse and maintain variety in sentence structure.