In English, children learn to converse first, then learn the grammar.
That is the common wisdom, Letty, but it is simply false. Children of all languages "learn" the grammar of their language in their first few years. Then, in most countries, they are subjected to the most inane, nonsensical, abysmally simplistic discussions of what some people think is grammar.
People can effectively learn a second language with some grammar instruction, but that is mostly pointing out how the patterns of thew target language differ from the mother tongue.
This should be kept to an absolute minimum because the notion that people can consciously learn the grammar of any language is really silly. Consider that those who use, for example, English, those who have studied the grammar of English for years, still don't know all there is to know about how language is used.
That's another common misconception - that all there is to know about a language has already been discovered.