Do you mean when you're starting a conversation with someone you don't know so well? In this case, it's very useful to try to find common ground. This is why starting a conversation by talking about the weather is very common - we can all see how it is, was and might be. This can lead to a conversation about past activities and future plans. Just a simple thing like this can help to break the ice and make you more relaxed. Also, try to understand the other person: What do they know already? What might they like to know? To what level will they understand what you want to tell them? And remember, the responsibility isn't just on you to make the conversation. Listen to what the other person says and use there ideas to get things going. You might feel nervous and this makes your mind go blank, but just starting by talking about something simple like the weather can really help you to relax and give you the confidence to move onto other topics. Your situation is very common, but keep trying and you'll get better with practice)

Well, at some point, it's very common. But I'm sure that you're more comfortable with some specific topics compared to others. You can speak better on some topics while on others you just can't. This mostly is due to lack of vocabulary on those topics. You just need to familiarize yourself with the most popular conversational topics and try to expand your vocabulary by reading and listening. Don't also try to be perfect in your answers, many students would do this mistake too. They want to construct perfect examples and answers to each questions. The goal is just to talk. As far as you are understood, it's enough. I suggest you to check these books; Oxford word skills, vocabulary in use, and collocation in use. It would be also helpful to look for a language partner or a tutor to practice conversations on different topics.

hi there! there are tons of topics in google. you can search them. but you should chose a topic for speaking, according to your needs and the things you like. wish you luck

Nothing

You can find conversational discussion lists online