In English, word order is more important than it is in many other languages. Very often ESL students produce sentences which sound strange to the native's ear because the order of the words in the sentences is wrong. Sentences do not have to have all of these parts, but if all of the parts do occur, they most likely will occur in this order. A change in basic sentence order can make an English sentence nonsensical or make it mean something completely different. For example, if part of the verb is moved so it comes before the subject, we have a question.
Word order is also important in English with phrases smaller that a sentence.
There are several problems that ESL speakers have with English verbs. The present tense in most language refers to actions that are taking place in the present. In English, this is not really true. We use present tense to refer to actions which are habitual, repeated, or always true. The action is not expressed by the verb alone.