It would be "floating in the air". This is because the air isn't something you can be "on" as it is not a solid, or dense enough to float on, like water. Water is sort of an exception, as you can technically float "in" and "on" the water. If you went scuba diving, you could say you were floating "in" the water, but if you went swimming in a pool you can also float "on" the water.

It means that there is more of the person to be discovered. When you say "There is more to <something> than meets the eye", it means that you haven't fully discovered everything about it yet, and that your opinion of that thing may change when you find out more.

It is not correct. You would simply use, "for the last week, I have had a headache". "Have been" or "Has been" is used in sentences where something has happened, like "Society has been changing" or "I have been to the shop". A headache is something you have, not something that has happened to you. "Have had" and "have been" are both past tense, but "have been" is only used when an event has occurred, such as going to the shop. I hope that makes sense. EDIT - Hi sorry, this explanation is wrong. the following link explains this question much better than I can. https://www.quora.com/What-is-the-difference-between-had-been-has-been-and-have-been

Depending on your level of English, children's songs can be quite good. They are simple enough that you can follow along, and contain enough words that you will probably learn some new ones. Another option is to watch English TV shows. I currently watch Japanese variety shows as I find them fun, and I usually end up picking up new words when they are repeated often enough. You could also go on twitch.tv and watch some streamers playing games you like. The good streamers usually talk a lot and interact with the viewers, so you can learn new words that way whilst also hearing native speakers talk lots.

Saving money implies that you have have money to put in a safe place, in case something bad happens. For example, if you got paid £1000 every month, you might save £100 of that and put it in to your spare bank account, just in case you lose your job. Being thrifty means that you don't have much money left to spend, so when you do spend money, you spend it very wisely. For instead of going to your usual clothes shop to buy new clothes, you might go to the charity shop where they sell very cheap clothes. "Thrifty" isn't really a word we use in the UK, it is used almost exclusively in the US, and they also have "Thrift stores" which are basically charity shops I believe, that take donations from people and then sell them at a really low cost.

"On the case" is used when you are going to do something, as in, find something, or get something. For example your mom might say, "Yusaku, please go and find my shoes", and you might respond "Ok, I'm on the case". It is fairly informal language, and we started to say it because of popular TV most likely. Police solves "cases", and in TV shows and movies, when a new "case" was opened and another mystery they had to solve, they would say "Leave it to me, I'm on the case". "In the case" would only make sense if you were physically in side of a case. For example if there was a really big suitcase, and you were playing hide and seek, you might hide inside the case.

First part is ok! "The weather could be rainy". This states that it might rain, but you are not completely sure. The next part is a little wrong. A correct way of saying it would be, "So, I would prefer it if you were to bring an umbrella". The first part "I would prefer it", means that you would like for something to happen. Adding "you were to" to the sentence states that you would like it if the person brought an umbrella with them. "If you were to" would be future tense. You could also not use a full stop, and blend it all in to one sentence, "The weather could be rainy, so I would prefer it if you were to bring an umbrella". A more natural way of saying it in a conversation would be "It might rain later", however the way you said it is grammatically fine. Another example of using "I would prefer" might be in the sentence, "I would prefer to have a hot shower before bed". Another example of "you were to" might be in the sentence, "If you were to hit me, I would be very sad".

Hi!* Nice to meet you.

I am a Spanish Italki Tutor but I am learning English too.
For my work I have to talk in English sometimes but I don´t know if I am doing well, but I don't think I am. :(
My pronunciation is not very good either, so I need you tell me where I am going wrong.

Thank you very much! :)

I wouldn't worry too much. This paragraph was very good. The one thing you kept doing wrong was not using a capital "i" when it is a single word, such as "I am very happy". If the letter "i" is on it's own in a sentence, it must always be a capital. You also must capitalise place names, such as England and Spain, as well as names of people, like Ashley. I would also avoid using more than one exclamation mark (!). Using more than one is fine if you were texting your friends or something, but you should avoid using more than one when you are trying to sound more professional, such as in a workplace or in letters and emails. On this website it should be ok, but I thought I would point it out just in case. Either way, very good job.