Headache is a countable noun. Headache= (i) something or someone that causes anxiety; a source of unhappiness: ‘The noise of traffic is a constant headache for me.’ (ii) pain in the head: ‘I woke up with a terrible headache.’ ‘My wife suffers from headache.’
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Possession – English editing.
A term used in grammar to mean that something belongs to someone or something else.  With nouns we show possession by the use of the possessive Apostrophe: Sue’s bungalow. The Government’s admission.  Pronouns change their form and can be used as Possessive Pronouns and Possessive Determiners: Subjective Possessive Possessive Pronoun Pronoun Determiner I […]
Come
Come is used for (1) movement towards the place where the speaker is, was, or intends to be (Move toward, travel toward something or somebody or approach something or somebody), or towards the person being talked about: ‘Come down here!’ ‘Come and look at this.’ ‘Why didn’t he come to see me?’  (2)Reach or arrive: […]