My girlfriend is a native speaker of English born in California but she often makes the same mistakes over and over again in spelling… 1. She often confuses there/their/they’re, to/too and your/you’re… 2. She consistently forgets to write the final -s in the third person singular verb conjugation of regular verbs. She also forgets to mark the possessive noun with an apostrophe s. She often writes “The man work in an office” instead of “… works…” and “the woman dog is friendly” instead of “… woman’s…” 3. She consistently forgets to write the final -ed when it comes to the past tense conjugation of verbs or when it comes to the passive voice. She writes “I fix my sink earlier” instead of “… fixed…” and “This show is sponsor by…” when it should be “… sponsored…” For 2 and 3 she doesn’t make the mistake in spoken English, only written. Will any of you be able to explain her mistakes to her? I tried to explain them but I am not good at that.