[Grammar] Yes, I know. I'm going to visit her this evening.

[kadioguy]

[FONT=Tahoma, Calibri, Verdana, Geneva, sans-serif]I will and I'm going to

Compare: [/FONT]
[FONT=Tahoma, Calibri, Verdana, Geneva, sans-serif]
a. 'Gary phoned while you were out.' 'OK. I'll call him back.' [/FONT]
[FONT=Tahoma, Calibri, Verdana, Geneva, sans-serif]b. 'Gary phoned while you were out.' 'Yes, I know. I'm going to call him back.' [/FONT]
[FONT=Tahoma, Calibri, Verdana, Geneva, sans-serif]
c. 'Anna is in hospital.' 'Oh really? I didn't know. I'll go and visit her.' [/FONT]
[FONT=Tahoma, Calibri, Verdana, Geneva, sans-serif]d. 'Anna is in hospital.' 'Yes, I know. I'm going to visit her this evening.'

([/FONT]English Grammar in Use 4th Edition, Unit 23)
-----------
Can I say the following? If they are OK, what are the differences in meaning between (b) and (e), (d) and (f)?

e. 'Gary phoned while you were out.' 'Yes, I knew. I'm going to call him back.'
f. 'Anna is in hospital.' 'Yes, I knew. I'm going to visit her this evening.'

 

[kadioguy]

b. 'Gary phoned while you were out.' 'Yes, I know. I'm going to call him back.'
e. 'Gary phoned while you were out.' 'Yes, I knew. I'm going to call him back.'

d. 'Anna is in hospital.' 'Yes, I know. I'm going to visit her this evening.'
f. 'Anna is in hospital.' 'Yes, I knew. I'm going to visit her this evening.'

The use of past-tense 'knew' in (e) and (f) may suggest that this is fairly old news.

Just a minor correction.