10. Какое из слов является разговорным? Поболтав, дамы решили организовать танцевальный вечер в гарнизоне не позднее

Поболтав is the conversational word in the sentence. It is an informal form of the verb "поболтать" (to chat, to talk). In formal speech or writing, the correct form would be "поговорив" or "поговоривши".

ТОМАТОВ is the incorrect word in the sentence. The correct form should be "ТОМАТА" (tomato). The noun "томат" (tomato) is masculine in Russian, and in plural genitive case, it takes the form "томатов".

ПЯТИСТАМИ is the incorrect word in the sentence. The correct form should be "ПЯТИСТА" (five hundred). The noun "сто" (hundred) is feminine, and in instrumental case with the number "пятьсот" (five hundred), it takes the form "пятьсотами".

ЗВОНЧЕ is the incorrect word in the sentence. The correct form should be "ЗВОНЧЕ". The adjective "звонкий" (ringing) has the comparative form "звонче" (more ringing).

Сопоставьте грамматические ошибки (Correct the grammar mistakes):
1. Я говорит по-английски. (Я говорю по-английски.)
2. Ему нужно работает. (Ему нужно работать.)
3. Книга лежит на стол. (Книга лежит на столе.)
4. Он знает меня с детства. (Он знает меня с детства.)

Совет: To improve your grammar skills, it is important to read and listen to correct Russian sentences. Practice speaking and writing in Russian as much as possible. Use grammar books or online resources to learn the rules and practice with exercises.