I can say and understand a few things in English.
I can communicate simply and understand in familiar situations but only with some difficulty.
I can make simple sentences and can understand the main points of a conversation but need much more vocabulary.
I can speak and understand reasonably well and can use basic tenses but have problems with more complex grammar and vocabulary.
I speak and understand well but still make mistakes and sometimes people do not understand me clearly
I speak and understand very well but sometimes have problems with unfamiliar situations and vocabulary.