English learning providing method

A method of providing an English learning service to a user by a server, the method comprising:

• outputting a sentence, which is a combination of one or more of sentence elements including a unit interrogative, an interrogative verb, a subject, a unit verb, and an object and includes an interrogative sentence, a negative sentence, or a declarative sentence, using one or more indicators each corresponding to one of the combined sentence elements;
• receiving a selection of a specific indicator that the user wants to learn among the one or more indicators from the user;
• outputting an example sentence, which includes English expressions corresponding to sentence elements each corresponding to one of the one or more indicators, corresponding to the specific indicator selected by the user together with the one or more indicators, wherein an English expression corresponding to the sentence element of the specific indicator is output as a blank;
• outputting an example list for an English expression insertable to the blank to the user together with the example sentence and receiving a specific English expression in the example list from the user;
• and
• outputting a Korean interpretation of a combined sentence, which is obtained by combining the received specific English expression and the example sentence including the blank, to the user, wherein it is determined whether the combined sentence is grammatically correct, the combined sentence is shown in a first color when it is determined that the combined sentence is grammatically correct, and the combined sentence is shown in a second color when it is determined that the combined sentence is grammatically incorrect,
• wherein the indicators are displayed together with marks representing what kinds of sentence elements correspond to the indicators so that the user is intuitively aware of which sentence elements will be at corresponding positions,
• when a quantity and positions of the combined sentence elements vary according to whether a type of the sentence is an interrogative sentence, a negative sentence, or a declarative sentence, a quantity and positions of the one or more indicators output to correspond to each of the combined sentence elements vary so that the user is aware of the type of the sentence,
• an English expression of the example sentence corresponding to the unit interrogative among the sentence elements includes at least one of “when,” “where,” “what,” “how,” “why,” and “who with,”
• an English expression of the example sentence corresponding to the interrogative verb among the sentence elements includes any one of “do,” “does,” “did,” “will,” “can,” “am,” “are,” “is,” “was,” “were,” “should,” “have,” “has,” “had” and “auxiliary verb,” and
• an English expression of the example sentence corresponding to the unit verb among the sentence elements includes a present tense of a verb, a past tense of the verb, and a past particle of the verb and also includes a combination of the present tense of the verb and one of “will,” “have to,” “can,” “want to,” “do not,” an auxiliary verb, a negative qualifier, a verb-qualifying word, and a verb-qualifying phrase.